diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29bb2d..03959eb4a32 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1 @@
+- Added support for the nodejs26 (in preview) runtime for Cloud Functions. (#11393)
\ No newline at end of file
diff --git a/schema/firebase-config.json b/schema/firebase-config.json
index 1338124e049..a5a357b2466 100644
--- a/schema/firebase-config.json
+++ b/schema/firebase-config.json
@@ -9,6 +9,7 @@
                 "nodejs20",
                 "nodejs22",
                 "nodejs24",
+                "nodejs26",
                 "python310",
                 "python311",
                 "python312",
@@ -1001,6 +1002,7 @@
                         "nodejs20",
                         "nodejs22",
                         "nodejs24",
+                        "nodejs26",
                         "python310",
                         "python311",
                         "python312",
@@ -1089,6 +1091,7 @@
                         "nodejs20",
                         "nodejs22",
                         "nodejs24",
+                        "nodejs26",
                         "python310",
                         "python311",
                         "python312",
diff --git a/src/deploy/functions/runtimes/node/parseRuntimeAndValidateSDK.spec.ts b/src/deploy/functions/runtimes/node/parseRuntimeAndValidateSDK.spec.ts
index 737b7737956..e9c05f21bd7 100644
--- a/src/deploy/functions/runtimes/node/parseRuntimeAndValidateSDK.spec.ts
+++ b/src/deploy/functions/runtimes/node/parseRuntimeAndValidateSDK.spec.ts
@@ -36,6 +36,10 @@ describe("getRuntimeChoice", () => {
     it("should return node 16 if runtime field is set to node 16", () => {
       expect(runtime.getRuntimeChoice("path/to/source", "nodejs16")).to.equal("nodejs16");
     });
+
+    it("should return node 26 if runtime field is set to node 26", () => {
+      expect(runtime.getRuntimeChoice("path/to/source", "nodejs26")).to.equal("nodejs26");
+    });
   });
 
   context("when the runtime is not set in firebase.json", () => {
@@ -63,6 +67,12 @@ describe("getRuntimeChoice", () => {
       expect(runtime.getRuntimeChoice("path/to/source")).to.equal("nodejs16");
     });
 
+    it("should return node 26 if engines field is set to node 26", () => {
+      cjsonStub.returns({ engines: { node: "26" } });
+
+      expect(runtime.getRuntimeChoice("path/to/source")).to.equal("nodejs26");
+    });
+
     it("should print warning when firebase-functions version is below 2.0.0", () => {
       cjsonStub.returns({ engines: { node: "16" } });
 
diff --git a/src/deploy/functions/runtimes/supported/index.ts b/src/deploy/functions/runtimes/supported/index.ts
index f5cbbb8fb3b..d8b52ba284b 100644
--- a/src/deploy/functions/runtimes/supported/index.ts
+++ b/src/deploy/functions/runtimes/supported/index.ts
@@ -24,19 +24,21 @@ export function latest<T extends Language>(
   language: T,
   runtimes: Runtime[] = Object.keys(RUNTIMES) as Runtime[],
 ): RuntimeOf<T> & Runtime {
-  const sorted = runtimes
-    .filter((s) => runtimeIsLanguage(s, language))
-    // node8 is less than node20
-    .sort((left, right) => {
-      const leftVersion = +left.substring(language.length);
-      const rightVersion = +right.substring(language.length);
-      if (isNaN(leftVersion) || isNaN(rightVersion)) {
-        throw new FirebaseError("Internal error. Runtime or language names are malformed", {
-          exit: 1,
-        });
-      }
-      return leftVersion - rightVersion;
-    });
+  const filtered = runtimes.filter((s) => runtimeIsLanguage(s, language));
+  // Prefer GA runtimes over preview/experimental runtimes so preview runtimes
+  // are not chosen as the default. If no GA runtimes exist (e.g. Dart), fall back.
+  const gaOnly = filtered.filter((s) => RUNTIMES[s]?.status === "GA");
+  const candidates = gaOnly.length > 0 ? gaOnly : filtered;
+  const sorted = candidates.sort((left, right) => {
+    const leftVersion = +left.substring(language.length);
+    const rightVersion = +right.substring(language.length);
+    if (isNaN(leftVersion) || isNaN(rightVersion)) {
+      throw new FirebaseError("Internal error. Runtime or language names are malformed", {
+        exit: 1,
+      });
+    }
+    return leftVersion - rightVersion;
+  });
   const latest = utils.last(sorted);
   if (!latest) {
     throw new FirebaseError(
@@ -62,7 +64,19 @@ export function isDecommissioned(runtime: Runtime, now: Date = new Date()): bool
  * increase testability.
  */
 export function guardVersionSupport(runtime: Runtime, now: Date = new Date()): void {
-  const { deprecationDate, decommissionDate } = RUNTIMES[runtime];
+  const { deprecationDate, decommissionDate, status } = RUNTIMES[runtime];
+
+  if (status === "beta") {
+    utils.logLabeledWarning(
+      "functions",
+      `Runtime ${RUNTIMES[runtime].friendly} is in Preview. Pre-release runtimes may not be suitable for production workloads.`,
+    );
+  } else if (status === "experimental") {
+    utils.logLabeledWarning(
+      "functions",
+      `Runtime ${RUNTIMES[runtime].friendly} is experimental. Pre-release runtimes may not be suitable for production workloads.`,
+    );
+  }
 
   const decommission = new Date(decommissionDate);
   if (now >= decommission) {
diff --git a/src/deploy/functions/runtimes/supported/supported.spec.ts b/src/deploy/functions/runtimes/supported/supported.spec.ts
index a099b406fe9..48b40408cec 100644
--- a/src/deploy/functions/runtimes/supported/supported.spec.ts
+++ b/src/deploy/functions/runtimes/supported/supported.spec.ts
@@ -9,6 +9,14 @@ describe("supported runtimes", () => {
     expect(supported.latest("nodejs")).to.not.equal("nodejs8");
   });
 
+  it("does not choose a preview runtime as latest when GA runtimes exist", () => {
+    expect(supported.latest("nodejs")).to.equal("nodejs24");
+  });
+
+  it("falls back to experimental/beta runtime when no GA runtime exists", () => {
+    expect(supported.latest("dart")).to.equal("dart3");
+  });
+
   it("identifies decommissioned runtimes", () => {
     expect(supported.isDecommissioned("nodejs8")).to.be.true;
   });
@@ -33,6 +41,22 @@ describe("supported runtimes", () => {
       logLabeledWarning.restore();
     });
 
+    it("warns for a preview runtime", () => {
+      supported.guardVersionSupport("nodejs26");
+      expect(logLabeledWarning).to.have.been.calledWith(
+        "functions",
+        "Runtime Node.js 26 is in Preview. Pre-release runtimes may not be suitable for production workloads.",
+      );
+    });
+
+    it("warns for an experimental runtime", () => {
+      supported.guardVersionSupport("dart3");
+      expect(logLabeledWarning).to.have.been.calledWith(
+        "functions",
+        "Runtime Dart 3 is experimental. Pre-release runtimes may not be suitable for production workloads.",
+      );
+    });
+
     it("throws an error for decommissioned runtimes", () => {
       expect(() => supported.guardVersionSupport("nodejs8")).to.throw(
         FirebaseError,
diff --git a/src/deploy/functions/runtimes/supported/types.ts b/src/deploy/functions/runtimes/supported/types.ts
index eee207d4f71..c77e6cad6e4 100644
--- a/src/deploy/functions/runtimes/supported/types.ts
+++ b/src/deploy/functions/runtimes/supported/types.ts
@@ -95,6 +95,13 @@ export const RUNTIMES = runtimes({
     deprecationDate: "2028-04-30",
     decommissionDate: "2028-10-31",
   },
+  // Note: Node.js 26 is currently in Preview on Cloud Run functions.
+  nodejs26: {
+    friendly: "Node.js 26",
+    status: "beta",
+    deprecationDate: "2029-04-30",
+    decommissionDate: "2029-10-31",
+  },
   python310: {
     friendly: "Python 3.10",
     status: "GA",