diff --git a/A00_Common/spreadsheet/spreadsheet_filter.ts b/A00_Common/spreadsheet/spreadsheet_filter.ts
new file mode 100644
index 00000000..328267d2
--- /dev/null
+++ b/A00_Common/spreadsheet/spreadsheet_filter.ts
@@ -0,0 +1,232 @@
+/* =============================================================================
+ * spreadsheet_filter.ts  (주인 A · 화면)
+ * 자동 필터 — 머리 행 칸마다 ▼ 단추 · 값 목록 창(모두 선택 · 값마다 체크 · 이 열 정렬 · 이 열 필터 지움).
+ * 걸러진 행은 엔진이 `행.걸러짐` 으로 적음(사용자 숨김과 따로) · 명령은 `필터`(spreadsheet_sortfilter.ts).
+ *
+ * 잇는 법(D · sub7 · C · sub6):
+ *   · 부품 붙이기: `const filter = attachFilter(ctx)` — 단추 층을 격자 overlay(editorSlot 층)에 얹음.
+ *     grid.render() 뒤마다 `filter.refresh()`(단추 자리 · 켜짐 표시) · 스크롤은 스스로 따라감.
+ *   · 도구 단추 「필터」 · Ctrl+Shift+L → `toggleFilter(ctx)`(켜기 = 고른 범위 · 칸 하나면 현재 영역 / 끄기).
+ *   · Alt+↓(활성 칸이 머리 행이면) → `filter.open(활성 열)`.
+ *   · 격자(C): 행 `걸러짐` 을 `숨김` 처럼 높이 0 으로 — 머리의 숨김 표시(두 줄)는 사용자 `숨김` 만.
+ * ========================================================================== */
+
+import { createButton, el, showToast } from "@ui/ui_template_elements";
+import { currentLanguageIndex } from "@ui/ui_template_locale";
+import { colName, parseRange, rangeToA1 } from "./spreadsheet_address";
+import { CommandError } from "./spreadsheet_commands";
+import { currentRegion, filterCommand, filterItems, sortCommand } from "./spreadsheet_sortfilter";
+import type { AutoFilter, Command } from "./spreadsheet_types";
+import type { PartHandle, SpreadsheetContext } from "./spreadsheet_view_types";
+import "./spreadsheet_sortfilter.css";
+
+const TEXT = {
+  Button: ["필터", "Filter"],
+  All: ["(모두 선택)", "(Select all)"],
+  Blank: ["(빈 칸)", "(Blanks)"],
+  SortAsc: ["오름차순 정렬", "Sort ascending"],
+  SortDesc: ["내림차순 정렬", "Sort descending"],
+  Clear: ["이 열 필터 지우기", "Clear filter from column"],
+  Ok: ["확인", "OK"],
+  Cancel: ["취소", "Cancel"],
+};
+const t = (key: keyof typeof TEXT) => TEXT[key][currentLanguageIndex] ?? TEXT[key][0];
+
+function send(ctx: SpreadsheetContext, make: () => Command): void {
+  try {
+    ctx.dispatch(make());
+  } catch (e) {
+    if (!(e instanceof CommandError)) throw e;
+    showToast(e.message, "error");
+  }
+}
+
+/** 필터 켜기 · 끄기 */
+export function toggleFilter(ctx: SpreadsheetContext): void {
+  if (ctx.readOnly) return;
+  const s = ctx.sheet();
+  if (s.필터) return send(ctx, () => filterCommand(ctx.book, ctx.engine, s.id, null));
+  const g = ctx.selection.범위[0];
+  const rg = g.r0 === g.r1 && g.c0 === g.c1 ? currentRegion(ctx.book, s.id, g.r0, g.c0) : g;
+  send(ctx, () => ({ 종류: "필터", 시트: s.id, 필터: { 범위: rangeToA1(rg) }, 걸러짐: [] }));
+}
+
+export interface FilterHandle extends PartHandle {
+  /** 열 `c` 값 목록 창 열기(필터 범위 안일 때) */
+  open(c: number): void;
+}
+
+export function attachFilter(ctx: SpreadsheetContext): FilterHandle {
+  const layer = el("div", { className: "ss-filter__layer" });
+  let panel: HTMLElement | null = null;
+
+  const filterOf = () => {
+    const f = ctx.sheet().필터;
+    const rg = f && parseRange(f.범위);
+    return f && rg ? { f, rg } : null;
+  };
+
+  /** 칸 자리 → 단추 층 안 자리(editorSlot 상자는 격자 뿌리 기준 — 층 원점과 다를 수 있어 실제 자리로 맞춤) */
+  function boxIn(r: number, c: number) {
+    const { layer: host, box } = ctx.grid.editorSlot(r, c);
+    const a = host.getBoundingClientRect();
+    const g = ctx.grid.root.getBoundingClientRect();
+    return { ...box, x: box.x - (a.left - g.left), y: box.y - (a.top - g.top) };
+  }
+
+  /** 머리 칸이 지금 보이나(틀고정 판이면 늘 보임) */
+  function shown(r: number, c: number): boolean {
+    const v = ctx.grid.visibleRange();
+    const fz = ctx.sheet().틀고정 ?? {};
+    const rowOk = r < (fz.행 ?? 0) || (r >= v.r0 && r <= v.r1);
+    const colOk = c < (fz.열 ?? 0) || (c >= v.c0 && c <= v.c1);
+    return rowOk && colOk;
+  }
+
+  function place(): void {
+    const { layer: host } = ctx.grid.editorSlot(0, 0);
+    if (layer.parentElement !== host) host.append(layer);
+    const cur = filterOf();
+    const btns: HTMLElement[] = [];
+    if (cur)
+      for (let c = cur.rg.c0; c <= cur.rg.c1; c++) {
+        const box = boxIn(cur.rg.r0, c);
+        if (!box.w || !box.h || !shown(cur.rg.r0, c)) continue;
+        const on = !!cur.f.조건?.[colName(c)];
+        const b = el("button", {
+          className: on ? "ss-filter__btn is-on" : "ss-filter__btn",
+          text: "▼",
+          attrs: {
+            type: "button",
+            "aria-label": `${t("Button")} ${colName(c)}`,
+            "data-col": String(c),
+          },
+        });
+        b.style.left = `${box.x + box.w - 17}px`;
+        b.style.top = `${box.y + box.h - 17}px`;
+        b.addEventListener("mousedown", (ev) => ev.stopPropagation());
+        b.addEventListener("click", () => open(c));
+        btns.push(b);
+      }
+    layer.replaceChildren(...btns, ...(panel ? [panel] : []));
+  }
+
+  function close(): void {
+    panel?.remove();
+    panel = null;
+    document.removeEventListener("mousedown", onOutside, true);
+  }
+
+  const onOutside = (ev: MouseEvent) => {
+    if (panel && !panel.contains(ev.target as Node)) close();
+  };
+
+  function apply(next: AutoFilter): void {
+    close();
+    send(ctx, () => filterCommand(ctx.book, ctx.engine, ctx.sheet().id, next));
+  }
+
+  function open(c: number): void {
+    const cur = filterOf();
+    if (!cur || c < cur.rg.c0 || c > cur.rg.c1 || ctx.readOnly) return;
+    close();
+    const sheetId = ctx.sheet().id;
+    const items = filterItems(ctx.book, ctx.engine, sheetId, c);
+    const boxes = items.map((it) => {
+      const cb = el("input", { attrs: { type: "checkbox" } });
+      cb.checked = it.켬;
+      return cb;
+    });
+    const all = el("input", { attrs: { type: "checkbox" } });
+    const ok = createButton({
+      label: t("Ok"),
+      onClick: () => {
+        const conds = { ...cur.f.조건 };
+        if (boxes.every((b) => b.checked)) delete conds[colName(c)];
+        else conds[colName(c)] = items.filter((_, i) => boxes[i].checked).map((it) => it.글);
+        apply({ ...cur.f, 조건: conds });
+      },
+    });
+    const sync = () => {
+      all.checked = boxes.every((b) => b.checked);
+      all.indeterminate = !all.checked && boxes.some((b) => b.checked);
+      ok.disabled = !boxes.some((b) => b.checked);
+    };
+    all.addEventListener("change", () => {
+      for (const b of boxes) b.checked = all.checked;
+      sync();
+    });
+    for (const b of boxes) b.addEventListener("change", sync);
+    const link = (label: string, run: () => void) => {
+      const a = el("button", {
+        className: "ss-filter__link",
+        text: label,
+        attrs: { type: "button" },
+      });
+      a.addEventListener("click", run);
+      return a;
+    };
+    const sortBy = (desc: boolean) => () => {
+      close();
+      send(ctx, () =>
+        sortCommand(ctx.book, ctx.engine, sheetId, cur.rg, {
+          머리: true,
+          기준: [{ 열: c, 내림: desc }],
+        }),
+      );
+    };
+    const rest = { ...cur.f.조건 };
+    delete rest[colName(c)];
+
+    panel = el("div", {
+      className: "ss-filter__panel",
+      attrs: { role: "dialog", "aria-label": `${t("Button")} ${colName(c)}` },
+      children: [
+        link(t("SortAsc"), sortBy(false)),
+        link(t("SortDesc"), sortBy(true)),
+        link(t("Clear"), () => apply({ ...cur.f, 조건: rest })),
+        el("div", {
+          className: "ss-filter__list",
+          children: [
+            el("label", { children: [all, t("All")] }),
+            ...items.map((it, i) =>
+              el("label", { children: [boxes[i], it.글 === "" ? t("Blank") : it.글] }),
+            ),
+          ],
+        }),
+        el("div", {
+          className: "ss-filter__foot",
+          children: [createButton({ label: t("Cancel"), variant: "ghost", onClick: close }), ok],
+        }),
+      ],
+    });
+    panel.addEventListener("keydown", (ev) => {
+      if (ev.key === "Escape") close();
+      ev.stopPropagation();
+    });
+    const box = boxIn(cur.rg.r0, c);
+    panel.style.left = `${box.x}px`;
+    panel.style.top = `${box.y + box.h}px`;
+    sync();
+    layer.append(panel);
+    document.addEventListener("mousedown", onOutside, true);
+  }
+
+  const onScroll = () => place();
+  ctx.grid.root.addEventListener("scroll", onScroll, true);
+  place();
+
+  return {
+    root: layer,
+    refresh() {
+      close();
+      place();
+    },
+    open,
+    destroy() {
+      close();
+      ctx.grid.root.removeEventListener("scroll", onScroll, true);
+      layer.remove();
+    },
+  };
+}
diff --git a/resources/tester/spreadsheet/harness_sortfilter.html b/resources/tester/spreadsheet/harness_sortfilter.html
new file mode 100644
index 00000000..7eaf596d
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter.html
@@ -0,0 +1,28 @@
+<!doctype html>
+<html lang="ko">
+  <head>
+    <meta charset="utf-8" />
+    <title>정렬 · 필터 시험 틀</title>
+    <link rel="stylesheet" href="../../../ui_template/ui_template_theme.css" />
+    <style>
+      body { margin: 0; font-family: sans-serif; }
+      #bar { margin: 8px; display: flex; gap: 8px; }
+      #host { height: 520px; margin: 8px; border: 1px solid #999; }
+    </style>
+  </head>
+  <body>
+    <div id="bar">
+      <button id="btn-sort">정렬…</button>
+      <button id="btn-asc">오름차순</button>
+      <button id="btn-desc">내림차순</button>
+      <button id="btn-filter">필터</button>
+      <button id="btn-undo">되돌리기</button>
+    </div>
+    <div id="host"></div>
+    <script>
+      window.ssErrors = [];
+      window.addEventListener("error", (e) => window.ssErrors.push(String(e.error?.stack || e.message)));
+    </script>
+    <script src="../../../tmp/spreadsheet_sortfilter/harness.js"></script>
+  </body>
+</html>
diff --git a/resources/tester/spreadsheet/harness_sortfilter.ts b/resources/tester/spreadsheet/harness_sortfilter.ts
new file mode 100644
index 00000000..6703ba73
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter.ts
@@ -0,0 +1,85 @@
+/* 정렬 · 자동 필터 화면 시험 틀 입구 — 진짜 부품(createSpreadsheet)에 정렬 대화 상자 · 필터 단추를 얹음.
+ * sub7 잇기 전이라 `parts.mountTabs` 를 감싸 문맥(ctx)을 꺼내고, grid.render 뒤 filter.refresh 를 부름.
+ * 번들: node harness_sortfilter_bundle.cjs → tmp/spreadsheet_sortfilter/harness.js (git 밖) */
+import { createSpreadsheet, parts } from "../../../A00_Common/spreadsheet/spreadsheet";
+import {
+  openSortDialog,
+  sortSelection,
+} from "../../../A00_Common/spreadsheet/spreadsheet_sort_dialog";
+import { attachFilter, toggleFilter } from "../../../A00_Common/spreadsheet/spreadsheet_filter";
+import type { SpreadsheetContext } from "../../../A00_Common/spreadsheet/spreadsheet_view_types";
+import type { Workbook } from "../../../A00_Common/spreadsheet/spreadsheet_types";
+
+const w = window as unknown as Record<string, unknown>;
+let ctx: SpreadsheetContext | null = null;
+const origTabs = parts.mountTabs;
+parts.mountTabs = (c: SpreadsheetContext) => {
+  ctx = c;
+  return origTabs(c);
+};
+
+const rows: [string, string, number][] = [
+  ["터파기", "토사", 12.5],
+  ["되메우기", "토사", 3],
+  ["잡석", "", 7.25],
+  ["터파기", "풍화암", 4],
+  ["콘크리트", "18-21-8", 9.9],
+  ["되메우기", "토사", 0],
+  ["거푸집", "합판 3회", 21],
+  ["터파기", "토사", 1.5],
+];
+const 칸: Workbook["시트"][number]["칸"] = {
+  A1: { 값: "공종" },
+  B1: { 값: "규격" },
+  C1: { 값: "수량" },
+  D1: { 값: "두 배" },
+  C12: { 식: "SUM(C2:C9)" },
+  B12: { 값: "합계" },
+};
+rows.forEach(([a, b, c], i) => {
+  const r = i + 2;
+  칸[`A${r}`] = { 값: a };
+  if (b) 칸[`B${r}`] = { 값: b };
+  칸[`C${r}`] = { 값: c, 서식: 1 };
+  칸[`D${r}`] = { 식: `C${r}*2`, 서식: 1 };
+});
+const book: Workbook = {
+  종류: "통합문서",
+  판: 1,
+  열: "harness",
+  서식: [{}, { 형식: "0.00" }],
+  시트: [{ id: "s1", 이름: "정렬필터", 칸, 행: { 11: { 숨김: true } } }],
+  활성: "s1",
+};
+
+const host = document.getElementById("host")!;
+w.ss = createSpreadsheet(host, book, {
+  onChange: () => (w.ssChanges = Number(w.ssChanges ?? 0) + 1),
+});
+const c = ctx as unknown as SpreadsheetContext;
+const filter = attachFilter(c);
+const render = c.grid.render.bind(c.grid);
+c.grid.render = () => {
+  render();
+  filter.refresh();
+};
+w.ssCtx = c;
+w.ssFilter = filter;
+w.ssSortDialog = () => openSortDialog(c);
+w.ssSortQuick = (desc: boolean) => sortSelection(c, desc);
+w.ssToggleFilter = () => toggleFilter(c);
+/** 열 값(보이는 칸 글) — 판정용 */
+w.ssCol = (letter: string, r0: number, r1: number) => {
+  const out: string[] = [];
+  for (let r = r0; r <= r1; r++)
+    out.push(document.querySelector(`[data-a1="${letter}${r}"]`)?.textContent ?? "");
+  return out;
+};
+for (const [id, run] of [
+  ["btn-sort", () => openSortDialog(c)],
+  ["btn-asc", () => sortSelection(c, false)],
+  ["btn-desc", () => sortSelection(c, true)],
+  ["btn-filter", () => toggleFilter(c)],
+  ["btn-undo", () => c.undo()],
+] as const)
+  document.getElementById(id)!.addEventListener("click", run);
diff --git a/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs b/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs
new file mode 100644
index 00000000..632917a1
--- /dev/null
+++ b/resources/tester/spreadsheet/harness_sortfilter_bundle.cjs
@@ -0,0 +1,29 @@
+/* 정렬 · 필터 시험 틀 번들 — rolldown(이미 설치) 한 파일 · css 는 <style> 로 넣음 · @ui 별칭.
+ * node harness_sortfilter_bundle.cjs → tmp/spreadsheet_sortfilter/harness.js (git 밖) */
+const fs = require("fs");
+const path = require("path");
+const ROOT = path.join(__dirname, "..", "..", "..");
+const { build } = require(path.join(ROOT, "config", "node_modules", "rolldown"));
+
+build({
+  input: path.join(__dirname, "harness_sortfilter.ts"),
+  resolve: { alias: { "@ui": path.join(ROOT, "ui_template") } },
+  plugins: [
+    {
+      name: "css-inline",
+      load(id) {
+        if (!id.endsWith(".css")) return null;
+        const css = JSON.stringify(fs.readFileSync(id, "utf8"));
+        const code = `const s = document.createElement("style"); s.textContent = ${css}; document.head.append(s);`;
+        return { code, moduleType: "js" };
+      },
+    },
+  ],
+  output: { file: path.join(ROOT, "tmp", "spreadsheet_sortfilter", "harness.js"), format: "iife" },
+}).then(
+  () => console.log("ok"),
+  (e) => {
+    console.error(e.message);
+    process.exit(1);
+  },
+);