diff --git a/crates/print/src/settings.rs b/crates/print/src/settings.rs
--- a/crates/print/src/settings.rs
+++ b/crates/print/src/settings.rs
@@ -180,7 +180,7 @@ impl Default for Settings {
 }
 
 /// Common paper sizes (points, portrait).
-pub const PAPERS: [(&str, (f64, f64)); 21] = [
+pub const PAPERS: [(&str, (f64, f64)); 23] = [
     ("US Letter", (612.0, 792.0)),
     ("US Legal", (612.0, 1008.0)),
     ("Tabloid", (792.0, 1224.0)),
@@ -202,6 +202,8 @@ pub const PAPERS: [(&str, (f64, f64)); 21] = [
     ("A0", (2383.94, 3370.39)),
     ("4 x 6 in label (101.6 x 152.4 mm)", (288.0, 432.0)),
     ("US #10 Envelope (4.125 x 9.5 in)", (297.0, 684.0)),
+    ("Folio (8.5 x 13 in)", (612.0, 936.0)),
+    ("Folio / F4 (8.27 x 13 in)", (595.28, 935.43)),
 ];
 
 /// `PAPERS` index of the 4 × 6 in shipping label.
@@ -236,6 +238,8 @@ pub fn cups_media(index: usize) -> Option<&'static str> {
         "A1" => "iso_a1_594x841mm",
         "A0" => "iso_a0_841x1189mm",
         "US #10 Envelope (4.125 x 9.5 in)" => "Env10",
+        "Folio (8.5 x 13 in)" => "na_folio_8.5x13in",
+        "Folio / F4 (8.27 x 13 in)" => "om_folio_210x330mm",
         _ if index == LABEL_PAPER => "w288h432",
         // A size added to PAPERS without a name here: its tests fail, and meanwhile the queue's
         // paper stands, as it did for every size before #1583.
diff --git a/crates/print/src/tests.rs b/crates/print/src/tests.rs
--- a/crates/print/src/tests.rs
+++ b/crates/print/src/tests.rs
@@ -747,10 +747,26 @@ fn every_paper_reaches_the_spooler_by_a_name_of_its_size() {
             ("A0", "iso_a0_841x1189mm"),
             ("4 x 6 in label (101.6 x 152.4 mm)", "w288h432"),
             ("US #10 Envelope (4.125 x 9.5 in)", "Env10"),
+            ("Folio (8.5 x 13 in)", "na_folio_8.5x13in"),
+            ("Folio / F4 (8.27 x 13 in)", "om_folio_210x330mm"),
         ]
     );
 }
 
+/// #4777: Folio (8.5 × 13 in) and Folio / F4 (8.27 × 13 in) presets are offered, fed by their
+/// PWG 5101.1 media names (`na_folio_8.5x13in` and `om_folio_210x330mm`) and laid out at their
+/// proper dimensions.
+#[test]
+fn folio_paper_sizes_are_available() {
+    let folio = PAPERS.iter().position(|(name, _)| *name == "Folio (8.5 x 13 in)").expect("Folio present");
+    assert_eq!(cups_media(folio), Some("na_folio_8.5x13in"));
+    assert_eq!(PAPERS[folio].1, (612.0, 936.0));
+
+    let f4 = PAPERS.iter().position(|(name, _)| *name == "Folio / F4 (8.27 x 13 in)").expect("Folio / F4 present");
+    assert_eq!(cups_media(f4), Some("om_folio_210x330mm"));
+    assert_eq!(PAPERS[f4].1, (595.28, 935.43));
+}
+
 /// #2734: the US #10 envelope (4.125 × 9.5 in) is offered, fed by its PPD name and laid out at
 /// its own size.
 #[test]