diff --git a/.github/workflows/action.ts b/.github/workflows/action.ts
index ae99305..8ae62c0 100755
--- a/.github/workflows/action.ts
+++ b/.github/workflows/action.ts
@@ -18,6 +18,11 @@ const inputs = defineInputs({
     required: false,
     default: "",
   },
+  "working-directory": {
+    description: "Directory to run dprint check in, relative to the workspace (ex. packages/app)",
+    required: false,
+    default: "",
+  },
   cache: {
     description: "Cache dprint's plugins and incremental state in the GitHub Actions cache (ex. true)",
     required: false,
@@ -217,9 +222,15 @@ const install = step({
 // the repo when dprint discovers the config itself (a remote config url can't
 // be hashed, so that falls back to the repo's config files too)
 const configPath = inputs["config-path"];
+const workingDirectory = inputs["working-directory"];
+// the config path is relative to the working directory, but hashFiles is
+// relative to the workspace
+const configPathInWorkspace = workingDirectory.notEquals("")
+  .then(concat(workingDirectory, "/", configPath))
+  .else(configPath);
 const configHash = configPath.notEquals("")
   .and(configPath.startsWith("http").not())
-  .then(hashFiles(configPath))
+  .then(hashFiles(configPathInWorkspace))
   .else(hashFiles("**/dprint.json", "**/dprint.jsonc", "**/.dprint.json", "**/.dprint.jsonc"));
 
 const prepareCache = step({
@@ -303,11 +314,13 @@ const check = step({
   name: "Check formatting",
   id: "check",
   env: {
+    WORKING_DIRECTORY: workingDirectory,
     CONFIG_PATH: configPath,
     ANNOTATIONS: inputs.annotations,
     ANNOTATE_SCRIPT: concat(expr("github.action_path"), "/scripts/annotate.mjs"),
   },
   run: [
+    `cd "\${WORKING_DIRECTORY:-.}"`,
     `args=(\${CONFIG_PATH:+--config "$CONFIG_PATH"} ${inputs.args})`,
     `if command -v node > /dev/null; then`,
     `  output="$RUNNER_TEMP/dprint-check.jsonl"`,
diff --git a/.github/workflows/ci.generated.yml b/.github/workflows/ci.generated.yml
index 30fc0c8..bb49ffb 100644
--- a/.github/workflows/ci.generated.yml
+++ b/.github/workflows/ci.generated.yml
@@ -75,6 +75,17 @@ jobs:
         uses: ./
         with:
           args: "--excludes poorly-formatted.json"
+      - name: Check formatting in a working directory
+        id: working-directory
+        uses: ./
+        with:
+          working-directory: tests/working-dir
+          config-path: dprint.json
+          cache: true
+      - name: Verify the working directory was checked
+        env:
+          UNFORMATTED_COUNT: "${{ steps.working-directory.outputs.unformatted-count }}"
+        run: test "$UNFORMATTED_COUNT" = "0"
       - name: Later steps can run dprint with the same cache
         run: |-
           test -n "$DPRINT_CACHE_DIR"
diff --git a/.github/workflows/ci.ts b/.github/workflows/ci.ts
index 1f9ebca..b35f54e 100755
--- a/.github/workflows/ci.ts
+++ b/.github/workflows/ci.ts
@@ -47,6 +47,14 @@ const unattestedVersionCheck = step({
   outputs: ["dprint-version"] as const,
 });
 
+const workingDirectoryCheck = step({
+  name: "Check formatting in a working directory",
+  id: "working-directory",
+  uses: "./",
+  with: { "working-directory": "tests/working-dir", "config-path": "dprint.json", cache: true },
+  outputs: ["unformatted-count"] as const,
+});
+
 const styleJob = job("style", {
   runsOn: matrix.os,
   strategy: { matrix },
@@ -110,6 +118,14 @@ const styleJob = job("style", {
       uses: "./",
       with: { args: "--excludes poorly-formatted.json" },
     },
+    // the poorly-formatted file at the root would fail this if the check
+    // didn't run in the directory, and the config path is relative to it
+    workingDirectoryCheck,
+    {
+      name: "Verify the working directory was checked",
+      env: { UNFORMATTED_COUNT: workingDirectoryCheck.outputs["unformatted-count"] },
+      run: `test "$UNFORMATTED_COUNT" = "0"`,
+    },
     {
       name: "Later steps can run dprint with the same cache",
       run: [
diff --git a/README.md b/README.md
index a61a17f..2d27954 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,18 @@ To use a specific config, specify that with the `config-path` input:
     config-path: dprint-ci.json
 ```
 
+### Working Directory
+
+To run `dprint check` in a subdirectory, such as a package in a monorepo, specify that with the `working-directory` input:
+
+```yml
+- uses: dprint/check@v2
+  with:
+    working-directory: packages/app
+```
+
+The `config-path` and `args` inputs are relative to the working directory, while the annotations and the `unformatted-files` output are relative to the workspace.
+
 ### Args
 
 To pass additional arguments to `dprint check`, pass them to the `args` input.
diff --git a/action.yml b/action.yml
index d0d93f0..da809ef 100644
--- a/action.yml
+++ b/action.yml
@@ -16,6 +16,10 @@ inputs:
     description: Additional arguments to pass to dprint check
     required: false
     default: ""
+  working-directory:
+    description: "Directory to run dprint check in, relative to the workspace (ex. packages/app)"
+    required: false
+    default: ""
   cache:
     description: Cache dprint's plugins and incremental state in the GitHub Actions cache (ex. true)
     required: false
@@ -189,7 +193,7 @@ runs:
       if: inputs.cache == 'true'
       shell: bash
       env:
-        CONFIG_HASH: '${{ inputs.config-path != '''' && !startsWith(inputs.config-path, ''http'') && hashFiles(inputs.config-path) || hashFiles(''**/dprint.json'', ''**/dprint.jsonc'', ''**/.dprint.json'', ''**/.dprint.jsonc'') }}'
+        CONFIG_HASH: '${{ inputs.config-path != '''' && !startsWith(inputs.config-path, ''http'') && (hashFiles(inputs.working-directory != '''' && format(''{0}/{1}'', inputs.working-directory, inputs.config-path) || inputs.config-path)) || hashFiles(''**/dprint.json'', ''**/dprint.jsonc'', ''**/.dprint.json'', ''**/.dprint.jsonc'') }}'
       run: |-
         # respect a directory the user already set so later steps share the same cache
         if [ -z "${DPRINT_CACHE_DIR:-}" ]; then
@@ -237,10 +241,12 @@ runs:
       id: check
       shell: bash
       env:
+        WORKING_DIRECTORY: "${{ inputs.working-directory }}"
         CONFIG_PATH: "${{ inputs.config-path }}"
         ANNOTATIONS: "${{ inputs.annotations }}"
         ANNOTATE_SCRIPT: "${{ github.action_path }}/scripts/annotate.mjs"
       run: |-
+        cd "${WORKING_DIRECTORY:-.}"
         args=(${CONFIG_PATH:+--config "$CONFIG_PATH"} ${{ inputs.args }})
         if command -v node > /dev/null; then
           output="$RUNNER_TEMP/dprint-check.jsonl"
diff --git a/tests/working-dir/dprint.json b/tests/working-dir/dprint.json
new file mode 100644
index 0000000..aa68796
--- /dev/null
+++ b/tests/working-dir/dprint.json
@@ -0,0 +1,5 @@
+{
+  "plugins": [
+    "npm:@dprint/json@0.23.0"
+  ]
+}
diff --git a/tests/working-dir/formatted.json b/tests/working-dir/formatted.json
new file mode 100644
index 0000000..9ca89ff
--- /dev/null
+++ b/tests/working-dir/formatted.json
@@ -0,0 +1,3 @@
+{
+  "formatted": true
+}