diff --git a/web/ui/mantine-ui/src/App.tsx b/web/ui/mantine-ui/src/App.tsx
index 44e4224d10..98d5dfd308 100644
--- a/web/ui/mantine-ui/src/App.tsx
+++ b/web/ui/mantine-ui/src/App.tsx
@@ -36,6 +36,7 @@ import {
   IconSearch,
   IconServer,
   IconServerCog,
+  IconTrash,
 } from "@tabler/icons-react";
 import {
   BrowserRouter,
@@ -56,6 +57,7 @@ import TSDBStatusPage from "./pages/TSDBStatusPage";
 import FlagsPage from "./pages/FlagsPage";
 import ConfigPage from "./pages/ConfigPage";
 import AgentPage from "./pages/AgentPage";
+import DeleteSeriesPage from "./pages/DeleteSeriesPage";
 import { Suspense } from "react";
 import ErrorBoundary from "./components/ErrorBoundary";
 import { ThemeSelector } from "./components/ThemeSelector";
@@ -162,6 +164,13 @@ const serverStatusPages = [
     element: <AlertmanagerDiscoveryPage />,
     inAgentMode: false,
   },
+  {
+    title: "Delete series",
+    path: "/delete-series",
+    icon: <IconTrash style={navIconStyle} />,
+    element: <DeleteSeriesPage />,
+    inAgentMode: false,
+  },
 ];
 
 const allStatusPages = [...monitoringStatusPages, ...serverStatusPages];
diff --git a/web/ui/mantine-ui/src/pages/DeleteSeriesPage.tsx b/web/ui/mantine-ui/src/pages/DeleteSeriesPage.tsx
new file mode 100644
index 0000000000..49556056ae
--- /dev/null
+++ b/web/ui/mantine-ui/src/pages/DeleteSeriesPage.tsx
@@ -0,0 +1,205 @@
+import { useState } from "react";
+import {
+  TextInput,
+  Button,
+  Group,
+  Alert,
+  Text,
+  Stack,
+} from "@mantine/core";
+import { IconAlertTriangle, IconCheck, IconTrash } from "@tabler/icons-react";
+import { useSettings } from "../state/settingsSlice";
+import { API_PATH } from "../api/api";
+import InfoPageStack from "../components/InfoPageStack";
+import InfoPageCard from "../components/InfoPageCard";
+
+export default function DeleteSeriesPage() {
+  const { pathPrefix } = useSettings();
+
+  const [matchers, setMatchers] = useState("");
+  const [startTime, setStartTime] = useState("");
+  const [endTime, setEndTime] = useState("");
+  const [error, setError] = useState<string | null>(null);
+  const [success, setSuccess] = useState<string | null>(null);
+  const [deleting, setDeleting] = useState(false);
+  const [cleaning, setCleaning] = useState(false);
+
+  const handleDelete = async () => {
+    setError(null);
+    setSuccess(null);
+
+    const matchList = matchers
+      .split("\n")
+      .map((m) => m.trim())
+      .filter((m) => m !== "");
+
+    if (matchList.length === 0) {
+      setError("Provide at least one match[] selector.");
+      return;
+    }
+
+    const params = new URLSearchParams();
+    for (const m of matchList) {
+      params.append("match[]", m);
+    }
+    if (startTime) {
+      params.append("start", startTime);
+    }
+    if (endTime) {
+      params.append("end", endTime);
+    }
+
+    setDeleting(true);
+    try {
+      const res = await fetch(
+        `${pathPrefix}/${API_PATH}/admin/tsdb/delete_series?${params.toString()}`,
+        {
+          method: "POST",
+          credentials: "same-origin",
+        }
+      );
+
+      if (!res.ok) {
+        if (res.headers.get("content-type")?.startsWith("application/json")) {
+          const body = await res.json();
+          throw new Error(body.error || res.statusText);
+        }
+        throw new Error(res.statusText);
+      }
+
+      setSuccess(
+        `Successfully deleted series matching: ${matchList.join(", ")}`
+      );
+      setMatchers("");
+      setStartTime("");
+      setEndTime("");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unknown error");
+    } finally {
+      setDeleting(false);
+    }
+  };
+
+  const handleCleanTombstones = async () => {
+    setError(null);
+    setSuccess(null);
+    setCleaning(true);
+
+    try {
+      const res = await fetch(
+        `${pathPrefix}/${API_PATH}/admin/tsdb/clean_tombstones`,
+        {
+          method: "POST",
+          credentials: "same-origin",
+        }
+      );
+
+      if (!res.ok) {
+        if (res.headers.get("content-type")?.startsWith("application/json")) {
+          const body = await res.json();
+          throw new Error(body.error || res.statusText);
+        }
+        throw new Error(res.statusText);
+      }
+
+      setSuccess("Tombstones cleaned successfully.");
+    } catch (err) {
+      setError(err instanceof Error ? err.message : "Unknown error");
+    } finally {
+      setCleaning(false);
+    }
+  };
+
+  return (
+    <InfoPageStack>
+      <InfoPageCard title="Delete Series" icon={IconTrash}>
+        <Stack gap="md">
+          <Alert
+            icon={<IconAlertTriangle size={16} />}
+            color="yellow"
+            title="Warning"
+          >
+            This operation marks matching series for deletion. Deleted data
+            cannot be recovered. Use Clean Tombstones afterwards to reclaim disk
+            space.
+          </Alert>
+
+          {error && (
+            <Alert color="red" title="Error" withCloseButton onClose={() => setError(null)}>
+              {error}
+            </Alert>
+          )}
+
+          {success && (
+            <Alert
+              icon={<IconCheck size={16} />}
+              color="green"
+              title="Success"
+              withCloseButton
+              onClose={() => setSuccess(null)}
+            >
+              {success}
+            </Alert>
+          )}
+
+          <TextInput
+            label="Series selector(s)"
+            description="PromQL series selectors, one per line. Example: up{job=&quot;prometheus&quot;}"
+            placeholder={'up{job="prometheus"}'}
+            value={matchers}
+            onChange={(e) => setMatchers(e.currentTarget.value)}
+            required
+          />
+
+          <Group grow>
+            <TextInput
+              label="Start time"
+              description="RFC3339 or Unix timestamp (optional)"
+              placeholder="2024-01-01T00:00:00Z"
+              value={startTime}
+              onChange={(e) => setStartTime(e.currentTarget.value)}
+            />
+            <TextInput
+              label="End time"
+              description="RFC3339 or Unix timestamp (optional)"
+              placeholder="2024-12-31T23:59:59Z"
+              value={endTime}
+              onChange={(e) => setEndTime(e.currentTarget.value)}
+            />
+          </Group>
+
+          <Group>
+            <Button
+              color="red"
+              leftSection={<IconTrash size={16} />}
+              onClick={handleDelete}
+              loading={deleting}
+              disabled={!matchers.trim()}
+            >
+              Delete series
+            </Button>
+          </Group>
+        </Stack>
+      </InfoPageCard>
+
+      <InfoPageCard title="Clean Tombstones">
+        <Stack gap="md">
+          <Text size="sm" c="dimmed">
+            After deleting series, tombstones mark the data for deletion but
+            do not free disk space immediately. Use this to remove tombstones
+            and reclaim storage.
+          </Text>
+          <Group>
+            <Button
+              variant="outline"
+              onClick={handleCleanTombstones}
+              loading={cleaning}
+            >
+              Clean tombstones
+            </Button>
+          </Group>
+        </Stack>
+      </InfoPageCard>
+    </InfoPageStack>
+  );
+}