diff --git a/.github/workflows/check-prettier-formatting-task.yml b/.github/workflows/check-prettier-formatting-task.yml
index e8174035..4294e759 100644
--- a/.github/workflows/check-prettier-formatting-task.yml
+++ b/.github/workflows/check-prettier-formatting-task.yml
@@ -90,6 +90,13 @@ on:
       - "**.mkdn?"
       - "**.ronn"
       - "**.workbook"
+      # TOML
+      - "**/Cargo.lock"
+      - "**/Cargo.toml.orig"
+      - "**/Gopkg.lock"
+      - "**/Pipfile"
+      - "**/pdm.lock"
+      - "**.toml"
       # YAML
       - "**/.clang-format"
       - "**/.clang-tidy"
@@ -189,6 +196,13 @@ on:
       - "**.mkdn?"
       - "**.ronn"
       - "**.workbook"
+      # TOML
+      - "**/Cargo.lock"
+      - "**/Cargo.toml.orig"
+      - "**/Gopkg.lock"
+      - "**/Pipfile"
+      - "**/pdm.lock"
+      - "**.toml"
       # YAML
       - "**/.clang-format"
       - "**/.clang-tidy"
diff --git a/.prettierignore b/.prettierignore
index 99d17548..474b9de0 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -4,3 +4,4 @@ node_modules/
 /other/clang-format-configuration/testdata/golden/samples/
 /other/clang-format-configuration/testdata/input/samples/
 /other/clang-format-configuration/.clang-format
+poetry.lock
diff --git a/.prettierrc.yml b/.prettierrc.yml
new file mode 100644
index 00000000..3525e3a8
--- /dev/null
+++ b/.prettierrc.yml
@@ -0,0 +1,3 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-prettier-formatting/toml/.prettierrc.yml
+plugins:
+  - prettier-plugin-toml
diff --git a/Taskfile.yml b/Taskfile.yml
index 74bc957e..2887a75a 100644
--- a/Taskfile.yml
+++ b/Taskfile.yml
@@ -351,6 +351,7 @@ tasks:
       - |
         cp \
           "{{.WORKFLOW_TEMPLATE_ASSETS_PATH}}/check-javascript/.eslintrc.yml" \
+          "{{.WORKFLOW_TEMPLATE_ASSETS_PATH}}/check-prettier-formatting/toml/.prettierrc.yml" \
           "{{.WORKFLOW_TEMPLATE_ASSETS_PATH}}/general/.editorconfig" \
           "{{.WORKFLOW_TEMPLATE_ASSETS_PATH}}/check-python/.flake8" \
           "{{.WORKFLOW_TEMPLATE_ASSETS_PATH}}/check-markdown/.markdownlint.yml" \
diff --git a/package-lock.json b/package-lock.json
index 57e9df02..8c7e7867 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -17,7 +17,8 @@
         "github-label-sync": "3.0.0",
         "markdown-link-check": "^3.13.7",
         "markdownlint-cli": "^0.45.0",
-        "prettier": "^3.5.3"
+        "prettier": "^3.5.3",
+        "prettier-plugin-toml": "^2.0.5"
       },
       "engines": {
         "node": "22.x"
@@ -382,6 +383,23 @@
         "node": ">=14.16"
       }
     },
+    "node_modules/@taplo/core": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/@taplo/core/-/core-0.2.0.tgz",
+      "integrity": "sha512-r8bl54Zj1In3QLkiW/ex694bVzpPJ9EhwqT9xkcUVODnVUGirdB1JTsmiIv0o1uwqZiwhi8xNnTOQBRQCpizrQ==",
+      "dev": true,
+      "license": "MIT"
+    },
+    "node_modules/@taplo/lib": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@taplo/lib/-/lib-0.5.0.tgz",
+      "integrity": "sha512-+xIqpQXJco3T+VGaTTwmhxLa51qpkQxCjRwezjFZgr+l21ExlywJFcDfTrNmL6lG6tqb0h8GyJKO3UPGPtSCWg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@taplo/core": "^0.2.0"
+      }
+    },
     "node_modules/@tootallnate/quickjs-emscripten": {
       "version": "0.23.0",
       "resolved": "https://registry.npmjs.org/@tootallnate/quickjs-emscripten/-/quickjs-emscripten-0.23.0.tgz",
@@ -4605,6 +4623,25 @@
         "url": "https://github.com/prettier/prettier?sponsor=1"
       }
     },
+    "node_modules/prettier-plugin-toml": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/prettier-plugin-toml/-/prettier-plugin-toml-2.0.5.tgz",
+      "integrity": "sha512-WjXXKQyY4TdXWHU1v73UJxK/oDLSppf+b9KrSVl2kC4ZOr9CIVPKTQ/JxttgbYMaH8r3ihw7WYhMpI1EFa1obg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@taplo/lib": "^0.5.0"
+      },
+      "engines": {
+        "node": ">=16.0.0"
+      },
+      "funding": {
+        "url": "https://opencollective.com/unts"
+      },
+      "peerDependencies": {
+        "prettier": "^3.0.3"
+      }
+    },
     "node_modules/progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
@@ -6086,6 +6123,21 @@
         "defer-to-connect": "^2.0.1"
       }
     },
+    "@taplo/core": {
+      "version": "0.2.0",
+      "resolved": "https://registry.npmjs.org/@taplo/core/-/core-0.2.0.tgz",
+      "integrity": "sha512-r8bl54Zj1In3QLkiW/ex694bVzpPJ9EhwqT9xkcUVODnVUGirdB1JTsmiIv0o1uwqZiwhi8xNnTOQBRQCpizrQ==",
+      "dev": true
+    },
+    "@taplo/lib": {
+      "version": "0.5.0",
+      "resolved": "https://registry.npmjs.org/@taplo/lib/-/lib-0.5.0.tgz",
+      "integrity": "sha512-+xIqpQXJco3T+VGaTTwmhxLa51qpkQxCjRwezjFZgr+l21ExlywJFcDfTrNmL6lG6tqb0h8GyJKO3UPGPtSCWg==",
+      "dev": true,
+      "requires": {
+        "@taplo/core": "^0.2.0"
+      }
+    },
     "@tootallnate/quickjs-emscripten": {
       "version": "0.23.0",
       "resolved": "https://registry.npmjs.org/@tootallnate/quickjs-emscripten/-/quickjs-emscripten-0.23.0.tgz",
@@ -9018,6 +9070,15 @@
       "integrity": "sha512-QQtaxnoDJeAkDvDKWCLiwIXkTgRhwYDEQCghU9Z6q03iyek/rxRh/2lC3HB7P8sWT2xC/y5JDctPLBIGzHKbhw==",
       "dev": true
     },
+    "prettier-plugin-toml": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/prettier-plugin-toml/-/prettier-plugin-toml-2.0.5.tgz",
+      "integrity": "sha512-WjXXKQyY4TdXWHU1v73UJxK/oDLSppf+b9KrSVl2kC4ZOr9CIVPKTQ/JxttgbYMaH8r3ihw7WYhMpI1EFa1obg==",
+      "dev": true,
+      "requires": {
+        "@taplo/lib": "^0.5.0"
+      }
+    },
     "progress": {
       "version": "2.0.3",
       "resolved": "https://registry.npmjs.org/progress/-/progress-2.0.3.tgz",
diff --git a/package.json b/package.json
index dc1616b4..ebb90f7e 100644
--- a/package.json
+++ b/package.json
@@ -9,7 +9,8 @@
     "github-label-sync": "3.0.0",
     "markdown-link-check": "^3.13.7",
     "markdownlint-cli": "^0.45.0",
-    "prettier": "^3.5.3"
+    "prettier": "^3.5.3",
+    "prettier-plugin-toml": "^2.0.5"
   },
   "dependencies": {
     "js-yaml": "^4.1.0"
diff --git a/workflow-templates/assets/check-prettier-formatting/.prettierignore b/workflow-templates/assets/check-prettier-formatting/.prettierignore
index e1f03f10..b5b48de3 100644
--- a/workflow-templates/assets/check-prettier-formatting/.prettierignore
+++ b/workflow-templates/assets/check-prettier-formatting/.prettierignore
@@ -1,3 +1,4 @@
 .licenses/
 __pycache__/
 node_modules/
+poetry.lock
diff --git a/workflow-templates/assets/check-prettier-formatting/toml/.prettierrc.yml b/workflow-templates/assets/check-prettier-formatting/toml/.prettierrc.yml
new file mode 100644
index 00000000..3525e3a8
--- /dev/null
+++ b/workflow-templates/assets/check-prettier-formatting/toml/.prettierrc.yml
@@ -0,0 +1,3 @@
+# Source: https://github.com/arduino/tooling-project-assets/blob/main/workflow-templates/assets/check-prettier-formatting/toml/.prettierrc.yml
+plugins:
+  - prettier-plugin-toml
diff --git a/workflow-templates/check-prettier-formatting-task.md b/workflow-templates/check-prettier-formatting-task.md
index e487da4c..8a724ece 100644
--- a/workflow-templates/check-prettier-formatting-task.md
+++ b/workflow-templates/check-prettier-formatting-task.md
@@ -8,6 +8,7 @@ Use [Prettier](https://prettier.io/docs/en/index.html) to check formatting. Supp
 - HTML
 - JSON
 - Markdown
+- TOML ([via plugin](#toml-support-optional))
 - YAML
 
 This is the version of the workflow for projects using the [Task](https://taskfile.dev/#/) task runner tool.
@@ -72,6 +73,25 @@ Add the following to [`/.gitignore`](https://git-scm.com/docs/gitignore):
 /node_modules/
 ```
 
+### TOML Support (Optional)
+
+If the project contains manually maintained [TOML](https://toml.io/) language files, some additional configuration is needed to add support to Prettier for this language.
+
+#### Assets
+
+- [`.prettierrc.yml`](assets/check-prettier-formatting/toml/.prettierrc.yml) - Prettier configuration file
+  - Install to: repository root.
+
+#### Dependencies
+
+Add the TOML support dependencies by running this command:
+
+```text
+npm install --save-dev prettier-plugin-toml@^2.0.2
+```
+
+Commit the resulting changes to the `package.json` and `package-lock.json` files.
+
 ### Readme badge
 
 Markdown badge:
diff --git a/workflow-templates/check-prettier-formatting-task.yml b/workflow-templates/check-prettier-formatting-task.yml
index e8174035..4294e759 100644
--- a/workflow-templates/check-prettier-formatting-task.yml
+++ b/workflow-templates/check-prettier-formatting-task.yml
@@ -90,6 +90,13 @@ on:
       - "**.mkdn?"
       - "**.ronn"
       - "**.workbook"
+      # TOML
+      - "**/Cargo.lock"
+      - "**/Cargo.toml.orig"
+      - "**/Gopkg.lock"
+      - "**/Pipfile"
+      - "**/pdm.lock"
+      - "**.toml"
       # YAML
       - "**/.clang-format"
       - "**/.clang-tidy"
@@ -189,6 +196,13 @@ on:
       - "**.mkdn?"
       - "**.ronn"
       - "**.workbook"
+      # TOML
+      - "**/Cargo.lock"
+      - "**/Cargo.toml.orig"
+      - "**/Gopkg.lock"
+      - "**/Pipfile"
+      - "**/pdm.lock"
+      - "**.toml"
       # YAML
       - "**/.clang-format"
       - "**/.clang-tidy"