diff --git a/fixtures/TEST_QUARTO.qmd b/fixtures/TEST_QUARTO.qmd
new file mode 100644
index 0000000000..7c4cfe08ca
--- /dev/null
+++ b/fixtures/TEST_QUARTO.qmd
@@ -0,0 +1,11 @@
+---
+title: Sample
+---
+
+Real link: <https://example.com>.
+
+```{.bash}
+curl -O https://cdn.posit.co/r/rhel-10/pkgs/R-${R_VERSION}-1-1.$(arch).rpm
+```
+
+Inline `https://inline.example.com/code` should also be excluded.
diff --git a/fixtures/TEST_RMARKDOWN.Rmd b/fixtures/TEST_RMARKDOWN.Rmd
new file mode 100644
index 0000000000..cfc1ed0c20
--- /dev/null
+++ b/fixtures/TEST_RMARKDOWN.Rmd
@@ -0,0 +1,13 @@
+---
+title: Sample R Markdown
+output: html_document
+---
+
+Real link: <https://example.com>.
+
+```{r setup, include=FALSE}
+# This URL should be ignored because it's inside a fenced code block
+download.file("https://cdn.posit.co/r/rhel-10/pkgs/R-${R_VERSION}-1-1.rpm")
+```
+
+Inline `https://inline.example.com/rmd` should also be excluded.
diff --git a/lychee-bin/src/config/mod.rs b/lychee-bin/src/config/mod.rs
index 652c3f5faf..86b1979677 100644
--- a/lychee-bin/src/config/mod.rs
+++ b/lychee-bin/src/config/mod.rs
@@ -224,7 +224,7 @@ pub(crate) struct Config {
     /// This is useful when the default extensions are not enough and you don't
     /// want to provide a long list of inputs (e.g. file1.html, file2.md, etc.)
     ///
-    /// [default: md,mkd,mdx,mdown,mdwn,mkdn,mkdown,markdown,html,htm,css,txt,xml]
+    /// [default: md,markdown,mdx,qmd,rmd,mkd,mkdn,mdwn,mdown,mkdown,html,htm,css,txt,xml]
     #[arg(long, verbatim_doc_comment)]
     extensions: Option<FileExtensions>,
 
diff --git a/lychee-bin/tests/cli.rs b/lychee-bin/tests/cli.rs
index 2216751175..e6f7671762 100644
--- a/lychee-bin/tests/cli.rs
+++ b/lychee-bin/tests/cli.rs
@@ -1801,6 +1801,35 @@ The config file should contain every possible key for documentation purposes."
             .stdout(contains("http://127.0.0.1/inline"))
             .stdout(contains("http://127.0.0.1/bash"));
     }
+
+    #[test]
+    fn test_quarto_treated_as_markdown() {
+        let input = fixtures_path!().join("TEST_QUARTO.qmd");
+
+        cargo_bin_cmd!()
+            .arg(input)
+            .arg("--dump")
+            .assert()
+            .success()
+            .stdout(contains("https://example.com"))
+            .stdout(contains("cdn.posit.co").not())
+            .stdout(contains("inline.example.com").not());
+    }
+
+    #[test]
+    fn test_rmarkdown_treated_as_markdown() {
+        let input = fixtures_path!().join("TEST_RMARKDOWN.Rmd");
+
+        cargo_bin_cmd!()
+            .arg(input)
+            .arg("--dump")
+            .assert()
+            .success()
+            .stdout(contains("https://example.com"))
+            .stdout(contains("cdn.posit.co").not())
+            .stdout(contains("inline.example.com").not());
+    }
+
     #[tokio::test]
     async fn test_verbatim_skipped_by_default_via_file() {
         let file = fixtures_path!().join("TEST_VERBATIM.html");
diff --git a/lychee-lib/src/types/file.rs b/lychee-lib/src/types/file.rs
index 269ae43ba5..3d46c20ce4 100644
--- a/lychee-lib/src/types/file.rs
+++ b/lychee-lib/src/types/file.rs
@@ -140,8 +140,10 @@ impl std::fmt::Display for FileType {
 
 impl FileType {
     /// All known Markdown extensions
+    // NOTE: Stored in reverse-popularity order because the `Iterator` impl for
+    // `FileExtensions` pops from the end
     const MARKDOWN_EXTENSIONS: &'static [&'static str] = &[
-        "markdown", "mkdown", "mkdn", "mdwn", "mdown", "mdx", "mkd", "md",
+        "mkdown", "mdown", "mdwn", "mkdn", "mkd", "rmd", "qmd", "mdx", "markdown", "md",
     ];
 
     /// All known HTML extensions
@@ -266,6 +268,9 @@ mod tests {
         assert_eq!(FileType::from("foo.md"), FileType::Markdown);
         assert_eq!(FileType::from("foo.MD"), FileType::Markdown);
         assert_eq!(FileType::from("foo.mdx"), FileType::Markdown);
+        assert_eq!(FileType::from("foo.qmd"), FileType::Markdown);
+        assert_eq!(FileType::from("foo.Rmd"), FileType::Markdown);
+        assert_eq!(FileType::from("foo.rmd"), FileType::Markdown);
 
         // Test that a file without an extension is considered plaintext
         assert_eq!(FileType::from("README"), FileType::Plaintext);