diff --git a/messages/en-US.json b/messages/en-US.json
index d75c3bdc2..5199aee71 100644
--- a/messages/en-US.json
+++ b/messages/en-US.json
@@ -1176,6 +1176,10 @@
     "idpJmespathAboutDescriptionLink": "Learn more about JMESPath",
     "idpJmespathLabel": "Identifier Path",
     "idpJmespathLabelDescription": "The path to the user identifier in the ID token",
+    "idpIdentifierChangeTitle": "Identifier Path Change Warning",
+    "idpIdentifierChangeDescription": "You are about to change the identifier path. This will affect how existing users are mapped. Users who previously signed in through this identity provider may no longer be recognized as the same users.",
+    "idpIdentifierChangeConfirmMessage": "I confirm",
+    "idpIdentifierChangeWarningText": "This will affect how existing users are mapped",
     "idpJmespathEmailPathOptional": "Email Path (Optional)",
     "idpJmespathEmailPathOptionalDescription": "The path to the user's email in the ID token",
     "idpJmespathNamePathOptional": "Name Path (Optional)",
diff --git a/src/app/[orgId]/settings/(private)/idp/[idpId]/general/page.tsx b/src/app/[orgId]/settings/(private)/idp/[idpId]/general/page.tsx
index b2ad61d67..e7e52b068 100644
--- a/src/app/[orgId]/settings/(private)/idp/[idpId]/general/page.tsx
+++ b/src/app/[orgId]/settings/(private)/idp/[idpId]/general/page.tsx
@@ -46,6 +46,7 @@ import { AxiosResponse } from "axios";
 import { ListRolesResponse } from "@server/routers/role";
 import AutoProvisionConfigWidget from "@app/components/AutoProvisionConfigWidget";
 import IdpAutoProvisionUsersDescription from "@app/components/IdpAutoProvisionUsersDescription";
+import IdpIdentifierChangeDialog from "@app/components/IdpIdentifierChangeDialog";
 import { PaidFeaturesAlert } from "@app/components/PaidFeaturesAlert";
 import { tierMatrix } from "@server/lib/billing/tierMatrix";
 import {
@@ -75,6 +76,12 @@ export default function GeneralPage() {
     >([createMappingBuilderRule()]);
     const [rawRoleExpression, setRawRoleExpression] = useState("");
     const [variant, setVariant] = useState<"oidc" | "google" | "azure">("oidc");
+    const [originalIdentifierPath, setOriginalIdentifierPath] = useState("");
+    const [identifierConfirmOpen, setIdentifierConfirmOpen] = useState(false);
+    const [pendingPayload, setPendingPayload] = useState<Record<
+        string,
+        unknown
+    > | null>(null);
 
     const dashboardRedirectUrl = `${env.app.dashboardUrl}/auth/idp/${idpId}/oidc/callback`;
     const [redirectUrl, setRedirectUrl] = useState(
@@ -184,6 +191,9 @@ export default function GeneralPage() {
                     const data = res.data.data;
                     const roleMapping = data.idpOrg.roleMapping;
                     const idpVariant = data.idpOidcConfig?.variant || "oidc";
+                    setOriginalIdentifierPath(
+                        data.idpOidcConfig?.identifierPath ?? "sub"
+                    );
                     setRedirectUrl(res.data.data.redirectUrl);
 
                     // Set the variant
@@ -378,18 +388,56 @@ export default function GeneralPage() {
                 };
             }
 
-            const res = await api.post(
-                `/org/${orgId}/idp/${idpId}/oidc`,
-                payload
-            );
+            const nextIdentifierPath =
+                variant === "oidc"
+                    ? (data as OidcFormValues).identifierPath
+                    : undefined;
 
-            if (res.status === 200) {
-                toast({
-                    title: t("success"),
-                    description: t("idpUpdatedDescription")
-                });
-                router.refresh();
+            if (
+                typeof nextIdentifierPath === "string" &&
+                nextIdentifierPath !== originalIdentifierPath
+            ) {
+                setPendingPayload(payload);
+                setIdentifierConfirmOpen(true);
+                return;
             }
+
+            await persistIdp(payload);
+        } catch (e) {
+            toast({
+                title: t("error"),
+                description: formatAxiosError(e),
+                variant: "destructive"
+            });
+        } finally {
+            setLoading(false);
+        }
+    }
+
+    async function persistIdp(payload: Record<string, unknown>) {
+        const res = await api.post(`/org/${orgId}/idp/${idpId}/oidc`, payload);
+
+        if (res.status === 200) {
+            if (typeof payload.identifierPath === "string") {
+                setOriginalIdentifierPath(payload.identifierPath);
+            }
+            toast({
+                title: t("success"),
+                description: t("idpUpdatedDescription")
+            });
+            router.refresh();
+        }
+    }
+
+    async function confirmIdentifierChange() {
+        if (!pendingPayload) {
+            return;
+        }
+
+        setLoading(true);
+        try {
+            await persistIdp(pendingPayload);
+            setPendingPayload(null);
         } catch (e) {
             toast({
                 title: t("error"),
@@ -407,6 +455,16 @@ export default function GeneralPage() {
 
     return (
         <>
+            <IdpIdentifierChangeDialog
+                open={identifierConfirmOpen}
+                setOpen={(open) => {
+                    setIdentifierConfirmOpen(open);
+                    if (!open) {
+                        setPendingPayload(null);
+                    }
+                }}
+                onConfirm={confirmIdentifierChange}
+            />
             <SettingsContainer>
                 <SettingsSection>
                     <SettingsSectionHeader>
diff --git a/src/app/admin/idp/[idpId]/general/page.tsx b/src/app/admin/idp/[idpId]/general/page.tsx
index c9506b027..8b7ed226f 100644
--- a/src/app/admin/idp/[idpId]/general/page.tsx
+++ b/src/app/admin/idp/[idpId]/general/page.tsx
@@ -41,6 +41,7 @@ import {
 } from "@app/components/InfoSection";
 import CopyToClipboard from "@app/components/CopyToClipboard";
 import IdpTypeBadge from "@app/components/IdpTypeBadge";
+import IdpIdentifierChangeDialog from "@app/components/IdpIdentifierChangeDialog";
 import { useTranslations } from "next-intl";
 
 export default function GeneralPage() {
@@ -51,6 +52,12 @@ export default function GeneralPage() {
     const [loading, setLoading] = useState(false);
     const [initialLoading, setInitialLoading] = useState(true);
     const [variant, setVariant] = useState<"oidc" | "google" | "azure">("oidc");
+    const [originalIdentifierPath, setOriginalIdentifierPath] = useState("");
+    const [identifierConfirmOpen, setIdentifierConfirmOpen] = useState(false);
+    const [pendingPayload, setPendingPayload] = useState<Record<
+        string,
+        unknown
+    > | null>(null);
 
     const redirectUrl = `${env.app.dashboardUrl}/auth/idp/${idpId}/oidc/callback`;
     const t = useTranslations();
@@ -141,6 +148,9 @@ export default function GeneralPage() {
                             | "google"
                             | "azure") || "oidc";
                     setVariant(idpVariant);
+                    setOriginalIdentifierPath(
+                        data.idpOidcConfig?.identifierPath ?? "sub"
+                    );
 
                     let tenantId = "";
                     if (idpVariant === "azure" && data.idpOidcConfig?.authUrl) {
@@ -258,15 +268,56 @@ export default function GeneralPage() {
                 };
             }
 
-            const res = await api.post(`/idp/${idpId}/oidc`, payload);
+            const nextIdentifierPath =
+                variant === "oidc"
+                    ? (data as OidcFormValues).identifierPath
+                    : undefined;
 
-            if (res.status === 200) {
-                toast({
-                    title: t("success"),
-                    description: t("idpUpdatedDescription")
-                });
-                router.refresh();
+            if (
+                typeof nextIdentifierPath === "string" &&
+                nextIdentifierPath !== originalIdentifierPath
+            ) {
+                setPendingPayload(payload);
+                setIdentifierConfirmOpen(true);
+                return;
             }
+
+            await persistIdp(payload);
+        } catch (e) {
+            toast({
+                title: t("error"),
+                description: formatAxiosError(e),
+                variant: "destructive"
+            });
+        } finally {
+            setLoading(false);
+        }
+    }
+
+    async function persistIdp(payload: Record<string, unknown>) {
+        const res = await api.post(`/idp/${idpId}/oidc`, payload);
+
+        if (res.status === 200) {
+            if (typeof payload.identifierPath === "string") {
+                setOriginalIdentifierPath(payload.identifierPath);
+            }
+            toast({
+                title: t("success"),
+                description: t("idpUpdatedDescription")
+            });
+            router.refresh();
+        }
+    }
+
+    async function confirmIdentifierChange() {
+        if (!pendingPayload) {
+            return;
+        }
+
+        setLoading(true);
+        try {
+            await persistIdp(pendingPayload);
+            setPendingPayload(null);
         } catch (e) {
             toast({
                 title: t("error"),
@@ -284,6 +335,16 @@ export default function GeneralPage() {
 
     return (
         <>
+            <IdpIdentifierChangeDialog
+                open={identifierConfirmOpen}
+                setOpen={(open) => {
+                    setIdentifierConfirmOpen(open);
+                    if (!open) {
+                        setPendingPayload(null);
+                    }
+                }}
+                onConfirm={confirmIdentifierChange}
+            />
             <SettingsContainer>
                 <SettingsSection>
                     <SettingsSectionHeader>
diff --git a/src/components/IdpIdentifierChangeDialog.tsx b/src/components/IdpIdentifierChangeDialog.tsx
new file mode 100644
index 000000000..03ba7ee20
--- /dev/null
+++ b/src/components/IdpIdentifierChangeDialog.tsx
@@ -0,0 +1,35 @@
+"use client";
+
+import ConfirmDeleteDialog from "@app/components/ConfirmDeleteDialog";
+import { useTranslations } from "next-intl";
+
+type IdpIdentifierChangeDialogProps = {
+    open: boolean;
+    setOpen: (open: boolean) => void;
+    onConfirm: () => Promise<void>;
+};
+
+export default function IdpIdentifierChangeDialog({
+    open,
+    setOpen,
+    onConfirm
+}: IdpIdentifierChangeDialogProps) {
+    const t = useTranslations();
+
+    return (
+        <ConfirmDeleteDialog
+            open={open}
+            setOpen={setOpen}
+            dialog={
+                <div className="space-y-2">
+                    <p>{t("idpIdentifierChangeDescription")}</p>
+                </div>
+            }
+            buttonText={t("saveGeneralSettings")}
+            onConfirm={onConfirm}
+            string={t("idpIdentifierChangeConfirmMessage")}
+            title={t("idpIdentifierChangeTitle")}
+            warningText={t("idpIdentifierChangeWarningText")}
+        />
+    );
+}