diff --git a/web/ui/mantine-ui/src/components/LabelBadges.tsx b/web/ui/mantine-ui/src/components/LabelBadges.tsx
index f60a37f032..8aa7135564 100644
--- a/web/ui/mantine-ui/src/components/LabelBadges.tsx
+++ b/web/ui/mantine-ui/src/components/LabelBadges.tsx
@@ -2,6 +2,7 @@ import { Badge, BadgeVariant, Group, MantineColor, Stack } from "@mantine/core";
 import { FC } from "react";
 import { escapeString } from "../lib/escapeString";
 import badgeClasses from "../Badge.module.css";
+import { maybeQuoteLabelName } from "../promql/utils";
 
 export interface LabelBadgesProps {
   labels: Record<string, string>;
@@ -30,7 +31,7 @@ export const LabelBadges: FC<LabelBadgesProps> = ({
           }}
           key={k}
         >
-          {k}="{escapeString(v)}"
+          {maybeQuoteLabelName(k)}="{escapeString(v)}"
         </Badge>
       );
     })}
diff --git a/web/ui/mantine-ui/src/lib/formatSeries.ts b/web/ui/mantine-ui/src/lib/formatSeries.ts
index b79c40076d..0076590706 100644
--- a/web/ui/mantine-ui/src/lib/formatSeries.ts
+++ b/web/ui/mantine-ui/src/lib/formatSeries.ts
@@ -1,12 +1,24 @@
+import {
+  maybeQuoteLabelName,
+  metricContainsExtendedCharset,
+} from "../promql/utils";
 import { escapeString } from "./escapeString";
 
+// TODO: Maybe replace this with the new PromLens-derived serialization code in src/promql/serialize.ts?
 export const formatSeries = (labels: { [key: string]: string }): string => {
   if (labels === null) {
     return "scalar";
   }
 
+  if (metricContainsExtendedCharset(labels.__name__ || "")) {
+    return `{"${escapeString(labels.__name__)}",${Object.entries(labels)
+      .filter(([k]) => k !== "__name__")
+      .map(([k, v]) => `${maybeQuoteLabelName(k)}="${escapeString(v)}"`)
+      .join(", ")}}`;
+  }
+
   return `${labels.__name__ || ""}{${Object.entries(labels)
     .filter(([k]) => k !== "__name__")
-    .map(([k, v]) => `${k}="${escapeString(v)}"`)
+    .map(([k, v]) => `${maybeQuoteLabelName(k)}="${escapeString(v)}"`)
     .join(", ")}}`;
 };
diff --git a/web/ui/mantine-ui/src/pages/query/SeriesName.tsx b/web/ui/mantine-ui/src/pages/query/SeriesName.tsx
index 66a7856f56..61bc62eee3 100644
--- a/web/ui/mantine-ui/src/pages/query/SeriesName.tsx
+++ b/web/ui/mantine-ui/src/pages/query/SeriesName.tsx
@@ -5,6 +5,10 @@ import classes from "./SeriesName.module.css";
 import { escapeString } from "../../lib/escapeString";
 import { useClipboard } from "@mantine/hooks";
 import { notifications } from "@mantine/notifications";
+import {
+  maybeQuoteLabelName,
+  metricContainsExtendedCharset,
+} from "../../promql/utils";
 
 interface SeriesNameProps {
   labels: { [key: string]: string } | null;
@@ -15,8 +19,26 @@ const SeriesName: FC<SeriesNameProps> = ({ labels, format }) => {
   const clipboard = useClipboard();
 
   const renderFormatted = (): React.ReactElement => {
+    const metricExtendedCharset =
+      labels && metricContainsExtendedCharset(labels.__name__ || "");
+
     const labelNodes: React.ReactElement[] = [];
     let first = true;
+
+    // If the metric name uses the extended new charset, we need to escape it,
+    // put it into the label matcher list, and make sure it's the first item.
+    if (metricExtendedCharset) {
+      labelNodes.push(
+        <span key="__name__">
+          <span className={classes.labelValue}>
+            "{escapeString(labels.__name__)}"
+          </span>
+        </span>
+      );
+
+      first = false;
+    }
+
     for (const label in labels) {
       if (label === "__name__") {
         continue;
@@ -37,7 +59,10 @@ const SeriesName: FC<SeriesNameProps> = ({ labels, format }) => {
             }}
             title="Click to copy label matcher"
           >
-            <span className={classes.labelName}>{label}</span>=
+            <span className={classes.labelName}>
+              {maybeQuoteLabelName(label)}
+            </span>
+            =
             <span className={classes.labelValue}>
               "{escapeString(labels[label])}"
             </span>
@@ -52,9 +77,11 @@ const SeriesName: FC<SeriesNameProps> = ({ labels, format }) => {
 
     return (
       <span>
-        <span className={classes.metricName}>
-          {labels ? labels.__name__ : ""}
-        </span>
+        {!metricExtendedCharset && (
+          <span className={classes.metricName}>
+            {labels ? labels.__name__ : ""}
+          </span>
+        )}
         {"{"}
         {labelNodes}
         {"}"}
@@ -62,10 +89,6 @@ const SeriesName: FC<SeriesNameProps> = ({ labels, format }) => {
     );
   };
 
-  if (labels === null) {
-    return <>scalar</>;
-  }
-
   if (format) {
     return renderFormatted();
   }
diff --git a/web/ui/mantine-ui/src/promql/format.tsx b/web/ui/mantine-ui/src/promql/format.tsx
index 05dd7d410e..3996444085 100644
--- a/web/ui/mantine-ui/src/promql/format.tsx
+++ b/web/ui/mantine-ui/src/promql/format.tsx
@@ -8,14 +8,21 @@ import ASTNode, {
   MatrixSelector,
 } from "./ast";
 import { formatPrometheusDuration } from "../lib/formatTime";
-import { maybeParenthesizeBinopChild, escapeString } from "./utils";
+import {
+  maybeParenthesizeBinopChild,
+  escapeString,
+  maybeQuoteLabelName,
+  metricContainsExtendedCharset,
+} from "./utils";
 
 export const labelNameList = (labels: string[]): React.ReactNode[] => {
   return labels.map((l, i) => {
     return (
       <span key={i}>
         {i !== 0 && ", "}
-        <span className="promql-code promql-label-name">{l}</span>
+        <span className="promql-code promql-label-name">
+          {maybeQuoteLabelName(l)}
+        </span>
       </span>
     );
   });
@@ -69,27 +76,45 @@ const formatAtAndOffset = (
 const formatSelector = (
   node: VectorSelector | MatrixSelector
 ): ReactElement => {
-  const matchLabels = node.matchers
-    .filter(
-      (m) =>
-        !(
-          m.name === "__name__" &&
-          m.type === matchType.equal &&
-          m.value === node.name
-        )
-    )
-    .map((m, i) => (
-      <span key={i}>
-        {i !== 0 && ","}
-        <span className="promql-label-name">{m.name}</span>
-        {m.type}
-        <span className="promql-string">"{escapeString(m.value)}"</span>
+  const matchLabels: JSX.Element[] = [];
+
+  // If the metric name contains the new extended charset, we need to escape it
+  // and add it at the beginning of the matchers list in the curly braces.
+  const metricName =
+    node.name ||
+    node.matchers.find(
+      (m) => m.name === "__name__" && m.type === matchType.equal
+    )?.value ||
+    "";
+  const metricExtendedCharset = metricContainsExtendedCharset(metricName);
+  if (metricExtendedCharset) {
+    matchLabels.push(
+      <span key="__name__">
+        <span className="promql-string">"{escapeString(metricName)}"</span>
       </span>
-    ));
+    );
+  }
+
+  matchLabels.push(
+    ...node.matchers
+      .filter((m) => !(m.name === "__name__" && m.type === matchType.equal))
+      .map((m, i) => (
+        <span key={i}>
+          {(i !== 0 || metricExtendedCharset) && ","}
+          <span className="promql-label-name">
+            {maybeQuoteLabelName(m.name)}
+          </span>
+          {m.type}
+          <span className="promql-string">"{escapeString(m.value)}"</span>
+        </span>
+      ))
+  );
 
   return (
     <>
-      <span className="promql-metric-name">{node.name}</span>
+      {!metricExtendedCharset && (
+        <span className="promql-metric-name">{metricName}</span>
+      )}
       {matchLabels.length > 0 && (
         <>
           {"{"}
diff --git a/web/ui/mantine-ui/src/promql/serialize.ts b/web/ui/mantine-ui/src/promql/serialize.ts
index af9c6ef151..1d2c63f4fc 100644
--- a/web/ui/mantine-ui/src/promql/serialize.ts
+++ b/web/ui/mantine-ui/src/promql/serialize.ts
@@ -11,8 +11,14 @@ import {
   aggregatorsWithParam,
   maybeParenthesizeBinopChild,
   escapeString,
+  metricContainsExtendedCharset,
+  maybeQuoteLabelName,
 } from "./utils";
 
+const labelNameList = (labels: string[]): string => {
+  return labels.map((ln) => maybeQuoteLabelName(ln)).join(", ");
+};
+
 const serializeAtAndOffset = (
   timestamp: number | null,
   startOrEnd: StartOrEnd,
@@ -28,15 +34,23 @@ const serializeAtAndOffset = (
 
 const serializeSelector = (node: VectorSelector | MatrixSelector): string => {
   const matchers = node.matchers
-    .filter(
-      (m) =>
-        !(
-          m.name === "__name__" &&
-          m.type === matchType.equal &&
-          m.value === node.name
-        )
-    )
-    .map((m) => `${m.name}${m.type}"${escapeString(m.value)}"`);
+    .filter((m) => !(m.name === "__name__" && m.type === matchType.equal))
+    .map(
+      (m) => `${maybeQuoteLabelName(m.name)}${m.type}"${escapeString(m.value)}"`
+    );
+
+  // If the metric name contains the new extended charset, we need to escape it
+  // and add it at the beginning of the matchers list in the curly braces.
+  const metricName =
+    node.name ||
+    node.matchers.find(
+      (m) => m.name === "__name__" && m.type === matchType.equal
+    )?.value ||
+    "";
+  const metricExtendedCharset = metricContainsExtendedCharset(metricName);
+  if (metricExtendedCharset) {
+    matchers.unshift(`"${escapeString(metricName)}"`);
+  }
 
   const range =
     node.type === nodeType.matrixSelector
@@ -48,7 +62,7 @@ const serializeSelector = (node: VectorSelector | MatrixSelector): string => {
     node.offset
   );
 
-  return `${node.name}${matchers.length > 0 ? `{${matchers.join(",")}}` : ""}${range}${atAndOffset}`;
+  return `${!metricExtendedCharset ? metricName : ""}${matchers.length > 0 ? `{${matchers.join(",")}}` : ""}${range}${atAndOffset}`;
 };
 
 const serializeNode = (
@@ -68,9 +82,9 @@ const serializeNode = (
     case nodeType.aggregation:
       return `${initialInd}${node.op}${
         node.without
-          ? ` without(${node.grouping.join(", ")}) `
+          ? ` without(${labelNameList(node.grouping)}) `
           : node.grouping.length > 0
-            ? ` by(${node.grouping.join(", ")}) `
+            ? ` by(${labelNameList(node.grouping)}) `
             : ""
       }(${childListSeparator}${
         aggregatorsWithParam.includes(node.op) && node.param !== null
@@ -119,16 +133,16 @@ const serializeNode = (
       const vm = node.matching;
       if (vm !== null && (vm.labels.length > 0 || vm.on)) {
         if (vm.on) {
-          matching = ` on(${vm.labels.join(", ")})`;
+          matching = ` on(${labelNameList(vm.labels)})`;
         } else {
-          matching = ` ignoring(${vm.labels.join(", ")})`;
+          matching = ` ignoring(${labelNameList(vm.labels)})`;
         }
 
         if (
           vm.card === vectorMatchCardinality.manyToOne ||
           vm.card === vectorMatchCardinality.oneToMany
         ) {
-          grouping = ` group_${vm.card === vectorMatchCardinality.manyToOne ? "left" : "right"}(${vm.include.join(",")})`;
+          grouping = ` group_${vm.card === vectorMatchCardinality.manyToOne ? "left" : "right"}(${labelNameList(vm.include)})`;
         }
       }
 
diff --git a/web/ui/mantine-ui/src/promql/serializeAndFormat.test.ts b/web/ui/mantine-ui/src/promql/serializeAndFormat.test.ts
index ea045612c1..a2b97ec904 100644
--- a/web/ui/mantine-ui/src/promql/serializeAndFormat.test.ts
+++ b/web/ui/mantine-ui/src/promql/serializeAndFormat.test.ts
@@ -99,7 +99,7 @@ describe("serializeNode and formatNode", () => {
           timestamp: null,
           startOrEnd: null,
         },
-        output: '{__name__="metric_name"} offset 1m',
+        output: "metric_name offset 1m",
       },
       {
         // Escaping in label values.
@@ -642,6 +642,113 @@ describe("serializeNode and formatNode", () => {
 == bool on(label1, label2) group_right(label3)
   …`,
       },
+      // Test new Prometheus 3.0 UTF-8 support.
+      {
+        node: {
+          bool: false,
+          lhs: {
+            bool: false,
+            lhs: {
+              expr: {
+                matchers: [
+                  {
+                    name: "__name__",
+                    type: matchType.equal,
+                    value: "metric_ä",
+                  },
+                  {
+                    name: "foo",
+                    type: matchType.equal,
+                    value: "bar",
+                  },
+                ],
+                name: "",
+                offset: 0,
+                startOrEnd: null,
+                timestamp: null,
+                type: nodeType.vectorSelector,
+              },
+              grouping: ["a", "ä"],
+              op: aggregationType.sum,
+              param: null,
+              type: nodeType.aggregation,
+              without: false,
+            },
+            matching: {
+              card: vectorMatchCardinality.manyToOne,
+              include: ["c", "ü"],
+              labels: ["b", "ö"],
+              on: true,
+            },
+            op: binaryOperatorType.div,
+            rhs: {
+              expr: {
+                matchers: [
+                  {
+                    name: "__name__",
+                    type: matchType.equal,
+                    value: "metric_ö",
+                  },
+                  {
+                    name: "bar",
+                    type: matchType.equal,
+                    value: "foo",
+                  },
+                ],
+                name: "",
+                offset: 0,
+                startOrEnd: null,
+                timestamp: null,
+                type: nodeType.vectorSelector,
+              },
+              grouping: ["d", "ä"],
+              op: aggregationType.sum,
+              param: null,
+              type: nodeType.aggregation,
+              without: true,
+            },
+            type: nodeType.binaryExpr,
+          },
+          matching: {
+            card: vectorMatchCardinality.oneToOne,
+            include: [],
+            labels: ["e", "ö"],
+            on: false,
+          },
+          op: binaryOperatorType.add,
+          rhs: {
+            expr: {
+              matchers: [
+                {
+                  name: "__name__",
+                  type: matchType.equal,
+                  value: "metric_ü",
+                },
+              ],
+              name: "",
+              offset: 0,
+              startOrEnd: null,
+              timestamp: null,
+              type: nodeType.vectorSelector,
+            },
+            type: nodeType.parenExpr,
+          },
+          type: nodeType.binaryExpr,
+        },
+        output:
+          'sum by(a, "ä") ({"metric_ä",foo="bar"}) / on(b, "ö") group_left(c, "ü") sum without(d, "ä") ({"metric_ö",bar="foo"}) + ignoring(e, "ö") ({"metric_ü"})',
+        prettyOutput: `    sum by(a, "ä") (
+      {"metric_ä",foo="bar"}
+    )
+  / on(b, "ö") group_left(c, "ü")
+    sum without(d, "ä") (
+      {"metric_ö",bar="foo"}
+    )
++ ignoring(e, "ö")
+  (
+    {"metric_ü"}
+  )`,
+      },
     ];
 
     tests.forEach((t) => {
diff --git a/web/ui/mantine-ui/src/promql/utils.ts b/web/ui/mantine-ui/src/promql/utils.ts
index 5477ee5968..2f1cc11d2f 100644
--- a/web/ui/mantine-ui/src/promql/utils.ts
+++ b/web/ui/mantine-ui/src/promql/utils.ts
@@ -267,6 +267,21 @@ export const humanizedValueType: Record<valueType, string> = {
   [valueType.matrix]: "range vector",
 };
 
+const metricNameRe = /^[a-zA-Z_:][a-zA-Z0-9_:]*$/;
+const labelNameCharsetRe = /^[a-zA-Z_][a-zA-Z0-9_]*$/;
+
+export const metricContainsExtendedCharset = (str: string) => {
+  return !metricNameRe.test(str);
+};
+
+export const labelNameContainsExtendedCharset = (str: string) => {
+  return !labelNameCharsetRe.test(str);
+};
+
 export const escapeString = (str: string) => {
   return str.replace(/([\\"])/g, "\\$1");
 };
+
+export const maybeQuoteLabelName = (str: string) => {
+  return labelNameContainsExtendedCharset(str) ? `"${escapeString(str)}"` : str;
+};