diff --git a/.changeset/eleven-olives-train.md b/.changeset/eleven-olives-train.md
new file mode 100644
index 000000000000..4f393068aff2
--- /dev/null
+++ b/.changeset/eleven-olives-train.md
@@ -0,0 +1,5 @@
+---
+'astro': minor
+---
+
+Adds support for an `--outDir` CLI flag to `astro build`
diff --git a/packages/astro/src/cli/build/index.ts b/packages/astro/src/cli/build/index.ts
index dd44823d1427..8919dfc40976 100644
--- a/packages/astro/src/cli/build/index.ts
+++ b/packages/astro/src/cli/build/index.ts
@@ -15,6 +15,7 @@ export async function build({ flags }: BuildOptions) {
 			tables: {
 				Flags: [
 					['--drafts', `Include Markdown draft pages in the build.`],
+					['--outDir <directory>', `Specify the output directory for the build.`],
 					['--help (-h)', 'See all available flags.'],
 				],
 			},
diff --git a/packages/astro/src/cli/flags.ts b/packages/astro/src/cli/flags.ts
index 54177e998585..c97f1801acf1 100644
--- a/packages/astro/src/cli/flags.ts
+++ b/packages/astro/src/cli/flags.ts
@@ -14,6 +14,7 @@ export function flagsToAstroInlineConfig(flags: Flags): AstroInlineConfig {
 		root: typeof flags.root === 'string' ? flags.root : undefined,
 		site: typeof flags.site === 'string' ? flags.site : undefined,
 		base: typeof flags.base === 'string' ? flags.base : undefined,
+		outDir: typeof flags.outDir === 'string' ? flags.outDir : undefined,
 		markdown: {
 			drafts: typeof flags.drafts === 'boolean' ? flags.drafts : undefined,
 		},