diff --git a/crates/ui-egui/src/editor.rs b/crates/ui-egui/src/editor.rs
index c6795e9..3a3d82c 100644
--- a/crates/ui-egui/src/editor.rs
+++ b/crates/ui-egui/src/editor.rs
@@ -35,6 +35,8 @@ pub struct EditState {
     pub request_focus: bool,
     /// The text changed programmatically: push `caret` into the widget on the next frame.
     pub sync_caret: bool,
+    /// Column AutoComplete: the full entry the typed text completes to.
+    pub completion: Option<String>,
     /// Move the caret to the end on the next frame.
     pub caret_to_end: bool,
 }
@@ -56,6 +58,7 @@ impl EditState {
             request_focus: true,
             sync_caret: true,
             caret_to_end: true,
+            completion: None,
         }
     }
 
@@ -272,3 +275,46 @@ mod tests {
         assert_eq!(r[3].3.as_deref(), Some("Sheet2"));
     }
 }
+
+/// Excel-style AutoComplete: the one distinct text entry in the same column (contiguous data
+/// above and below) that starts with `typed` (case-insensitive). `None` when ambiguous.
+pub fn column_completion(sheet: &sheetcraft_engine::model::Sheet, at: CellRef, typed: &str) -> Option<String> {
+    if typed.is_empty() || typed.starts_with('=') || typed.chars().all(|c| c.is_ascii_digit() || c == '.' || c == '-') {
+        return None;
+    }
+    let lower = typed.to_lowercase();
+    let mut found: Option<String> = None;
+    let mut ambiguous = false;
+    let mut scan = |row: u32| -> bool {
+        match sheet.value(CellRef::new(row, at.col)) {
+            sheetcraft_engine::core::Value::Empty => false,
+            sheetcraft_engine::core::Value::Text(t) => {
+                if t.to_lowercase().starts_with(&lower) && t.len() > typed.len() {
+                    match &found {
+                        Some(f) if !f.eq_ignore_ascii_case(&t) => ambiguous = true,
+                        None => found = Some(t.to_string()),
+                        _ => {}
+                    }
+                }
+                true
+            }
+            _ => true,
+        }
+    };
+    let mut r = at.row;
+    let mut n = 0;
+    while r > 0 && n < 5000 {
+        r -= 1;
+        n += 1;
+        if !scan(r) {
+            break;
+        }
+    }
+    let mut r = at.row + 1;
+    n = 0;
+    while n < 5000 && scan(r) {
+        r += 1;
+        n += 1;
+    }
+    if ambiguous { None } else { found }
+}
diff --git a/crates/ui-egui/src/formula_bar.rs b/crates/ui-egui/src/formula_bar.rs
index a539b3a..66cb684 100644
--- a/crates/ui-egui/src/formula_bar.rs
+++ b/crates/ui-egui/src/formula_bar.rs
@@ -285,6 +285,13 @@ pub fn editor_widget(app: &mut SheetApp, ui: &mut egui::Ui, id: egui::Id, font:
         ed.caret = r.primary.index.into();
     }
     if resp.changed() {
+        ed.completion = None;
+        if !ed.is_formula()
+            && ed.caret == ed.text.chars().count()
+            && let Some(sh) = app.session.active().and_then(|d| d.wb.sheet(ed.sheet))
+        {
+            ed.completion = crate::editor::column_completion(sh, ed.cell, &ed.text);
+        }
         ed.point = None;
         let names: Vec<String> = function_names();
         ed.update_autocomplete(&names);
@@ -296,6 +303,21 @@ pub fn editor_widget(app: &mut SheetApp, ui: &mut egui::Ui, id: egui::Id, font:
             sheetcraft_engine::Mode::Edit
         };
     }
+    // Column AutoComplete: the rest of the suggested entry, shown selected after the caret.
+    if let Some(full) = &ed.completion
+        && full.len() > ed.text.len()
+        && let Some(rest) = full.get(ed.text.len()..)
+    {
+        let pos = resp.rect.left_top() + egui::vec2(output.galley.rect.width(), 0.0);
+        let g = ui.painter().layout_no_wrap(
+            rest.to_string(),
+            output.galley.job.sections.first().map(|s| s.format.font_id.clone()).unwrap_or_default(),
+            Color32::WHITE,
+        );
+        let r = egui::Rect::from_min_size(pos, g.size());
+        ui.painter().rect_filled(r, 0.0, Color32::from_rgb(0x2E, 0x6F, 0xD8));
+        ui.painter().galley(pos, g, Color32::WHITE);
+    }
     // Autocomplete list and argument hint under the editor.
     if mine && (!ed.autocomplete.is_empty() || ed.current_function().is_some()) {
         let below = resp.rect.left_bottom() + vec2(0.0, 4.0);
diff --git a/crates/ui-egui/src/lib.rs b/crates/ui-egui/src/lib.rs
index 4d16f0b..149222a 100644
--- a/crates/ui-egui/src/lib.rs
+++ b/crates/ui-egui/src/lib.rs
@@ -280,7 +280,11 @@ impl SheetApp {
             Some(t) => (t, true),
             None => (current.clone(), false),
         };
-        self.editor = Some(editor::EditState::new(d.wb.active_sheet, at, text, replace, from_formula_bar));
+        let mut ed = editor::EditState::new(d.wb.active_sheet, at, text, replace, from_formula_bar);
+        if replace && !ed.is_formula() {
+            ed.completion = editor::column_completion(sh, at, &ed.text);
+        }
+        self.editor = Some(ed);
         self.session.mode = if replace { sheetcraft_engine::Mode::Enter } else { sheetcraft_engine::Mode::Edit };
     }
 
@@ -288,7 +292,10 @@ impl SheetApp {
     pub fn commit_edit(&mut self, dr: i64, dc: i64, array: bool, fill_selection: bool) -> bool {
         let Some(ed) = self.editor.take() else { return true };
         self.session.mode = sheetcraft_engine::Mode::Ready;
-        let text = ed.text.clone();
+        let text = match &ed.completion {
+            Some(full) if full.to_lowercase().starts_with(&ed.text.to_lowercase()) => full.clone(),
+            _ => ed.text.clone(),
+        };
         // Data validation.
         if let Some(d) = self.session.active()
             && let Some((dv, msg)) = sheetcraft_engine::cmd::data::check_validation(&d.wb, ed.sheet, ed.cell, &text)
diff --git a/crates/ui-egui/tests/interaction.rs b/crates/ui-egui/tests/interaction.rs
index 1485cc3..d5cba8b 100644
--- a/crates/ui-egui/tests/interaction.rs
+++ b/crates/ui-egui/tests/interaction.rs
@@ -111,3 +111,17 @@ fn dialogs_open_and_close() {
         h.state_mut().message = None;
     }
 }
+
+#[test]
+fn column_autocomplete_completes_on_enter() {
+    let mut s = blank();
+    s.execute("range.setValues", json!({"range": "A1", "values": [["North"], ["East"], ["Eastern"]]})).unwrap();
+    s.execute("selection.set", json!({"cell": "A4"})).unwrap();
+    let mut h = harness(s);
+    text(&mut h, "No");
+    key(&mut h, Key::Enter, Modifiers::NONE);
+    assert_eq!(value(&h, "A4"), Value::from("North"));
+    text(&mut h, "Ea"); // ambiguous: East / Eastern
+    key(&mut h, Key::Enter, Modifiers::NONE);
+    assert_eq!(value(&h, "A5"), Value::from("Ea"));
+}