diff --git a/src/types/timeline/api.ts b/src/types/timeline/api.ts
new file mode 100644
index 00000000..76aa827e
--- /dev/null
+++ b/src/types/timeline/api.ts
@@ -0,0 +1,85 @@
+import type { TProviderType } from "../dashboard/provider";
+
+/*타임라인 추적 지표*/
+export const TIMELINE_METRICS = [
+  "CLICK",
+  "CONVERSION",
+  "IMPRESSION",
+  "ROAS",
+] as const;
+export type TTimelineMetric = (typeof TIMELINE_METRICS)[number];
+
+/*성과 상태*/
+export const TIMELINE_PERFORMANCE_STATUS = [
+  "ON_TRACK",
+  "AT_RISK",
+  "OFF_TRACK",
+] as const;
+export type TTimelinePerformanceStatus =
+  (typeof TIMELINE_PERFORMANCE_STATUS)[number];
+
+/*비교 기간 타입*/
+export const TIMELINE_COMPARISON_PERIOD_TYPES = [
+  "LAST_WEEK",
+  "LAST_MONTH",
+  "PREVIOUS_PERIOD",
+] as const;
+export type TTimelineComparisonPeriodType =
+  (typeof TIMELINE_COMPARISON_PERIOD_TYPES)[number];
+
+export interface ITimelineListItem {
+  timelineId: number;
+  name: string;
+  startDate: string;
+  endDate: string;
+  performanceStatus: TTimelinePerformanceStatus;
+}
+
+export interface ITimelineDailyTrend {
+  date: string;
+  clicks: number;
+  conversions: number;
+  impressions: number;
+  roas: number;
+}
+
+export interface ITimelinePlatformContribution {
+  platform: TProviderType;
+  contributionRate: number;
+}
+
+export interface ITimelineDetail {
+  timelineId: number;
+  name: string;
+  startDate: string;
+  endDate: string;
+  performanceStatus: TTimelinePerformanceStatus;
+  metrics: TTimelineMetric[];
+  summary: string;
+  dailyTrend: ITimelineDailyTrend[];
+  platformContributions: ITimelinePlatformContribution[];
+}
+
+/* Request body*/
+export interface ITimelineUpsertRequest {
+  name: string;
+  startDate: string;
+  endDate: string;
+  metrics: TTimelineMetric[];
+  comparisonPeriodType: TTimelineComparisonPeriodType;
+}
+
+export interface ITimelineMutationResponse {
+  timelineId: number;
+  name: string;
+  startDate: string;
+  endDate: string;
+  metrics: TTimelineMetric[];
+  comparisonStartDate: string;
+  comparisonEndDate: string;
+  performanceStatus: TTimelinePerformanceStatus;
+  createdAt: string;
+}
+
+/*DELETE / summary 요청 등 빈 data*/
+export type TTimelineEmptyResponse = Record<string, never>;
diff --git a/src/types/timeline/form.ts b/src/types/timeline/form.ts
new file mode 100644
index 00000000..90e22388
--- /dev/null
+++ b/src/types/timeline/form.ts
@@ -0,0 +1,21 @@
+import type {
+  TTimelineComparisonPeriodType,
+  TTimelineMetric,
+} from "@/types/timeline/api";
+
+export interface ITimelineFormValues {
+  name: string;
+  startDate: string;
+  endDate: string;
+  metrics: TTimelineMetric[];
+  comparisonPeriodType: TTimelineComparisonPeriodType;
+}
+
+/*후속 zod 연동 전 기본값*/
+export const TIMELINE_FORM_DEFAULT_VALUES: ITimelineFormValues = {
+  name: "",
+  startDate: "",
+  endDate: "",
+  metrics: ["CLICK"],
+  comparisonPeriodType: "LAST_WEEK",
+};
diff --git a/src/types/timeline/summary.ts b/src/types/timeline/summary.ts
new file mode 100644
index 00000000..3684a106
--- /dev/null
+++ b/src/types/timeline/summary.ts
@@ -0,0 +1,26 @@
+import type { TProviderType } from "@/types/dashboard/provider";
+import type { TTimelineMetric } from "@/types/timeline/api";
+
+/*패널 상단 KPI 카드 한개*/
+export interface ITimelineSummaryMetric {
+  metric: TTimelineMetric;
+  label: string; //클릭, 전환 등 UI 라벨
+  value: number; //실제 값
+  unit?: string; // %, 회
+  changeRate?: number; //전기 대비 (-0.05 = -5%)
+}
+
+/*플랫폼 기여도*/
+export interface ITimelineSummaryPlatformShare {
+  provider: TProviderType;
+  contributionRate: number; /*기여도*/
+}
+
+/*성과 요약 패널 전체*/
+export interface ITimelineSummaryPanelData {
+  timelineName: string;
+  periodLabel: string;
+  aiSummary: string;
+  metrics: ITimelineSummaryMetric[];
+  platformShare: ITimelineSummaryPlatformShare[];
+}
diff --git a/src/types/timeline/timeline.mock.ts b/src/types/timeline/timeline.mock.ts
new file mode 100644
index 00000000..8aaf94df
--- /dev/null
+++ b/src/types/timeline/timeline.mock.ts
@@ -0,0 +1,141 @@
+import type {
+  ITimelineDetail,
+  ITimelineListItem,
+  ITimelineMutationResponse,
+} from "@/types/timeline/api";
+import type { ITimelineSummaryPanelData } from "@/types/timeline/summary";
+import type { ITimelineGridData } from "@/types/timeline/ui";
+
+/*GET /timeline 목록 mock*/
+export const TIMELINE_LIST_MOCK: ITimelineListItem[] = [
+  {
+    timelineId: 1,
+    name: "6월 봄 프로모션",
+    startDate: "2026-06-01",
+    endDate: "2026-06-30",
+    performanceStatus: "ON_TRACK",
+  },
+  {
+    timelineId: 2,
+    name: "리타겟팅 집중 기간",
+    startDate: "2026-06-10",
+    endDate: "2026-06-30",
+    performanceStatus: "AT_RISK",
+  },
+];
+
+/*GET /timeline/{id} 상세 mock*/
+export const TIMELINE_DETAIL_MOCK: ITimelineDetail = {
+  timelineId: 1,
+  name: "6월 봄 프로모션",
+  startDate: "2026-06-01",
+  endDate: "2026-06-30",
+  performanceStatus: "ON_TRACK",
+  metrics: ["CLICK", "CONVERSION", "ROAS"],
+  summary:
+    "Google Ads 전환이 전주 대비 12% 상승했습니다. Meta는 노출은 늘었으나 ROAS가 소폭 하락했습니다.",
+  dailyTrend: [
+    {
+      date: "2026-06-18",
+      clicks: 1240,
+      conversions: 86,
+      impressions: 45200,
+      roas: 3.2,
+    },
+    {
+      date: "2026-06-19",
+      clicks: 1310,
+      conversions: 91,
+      impressions: 46800,
+      roas: 3.4,
+    },
+    {
+      date: "2026-06-20",
+      clicks: 1180,
+      conversions: 78,
+      impressions: 44100,
+      roas: 2.9,
+    },
+  ],
+  platformContributions: [
+    { platform: "GOOGLE", contributionRate: 0.52 },
+    { platform: "META", contributionRate: 0.31 },
+    { platform: "NAVER", contributionRate: 0.17 },
+  ],
+};
+
+/*POST 생성 응답 mock*/
+export const TIMELINE_CREATE_RESPONSE_MOCK: ITimelineMutationResponse = {
+  timelineId: 3,
+  name: "신규 타임라인",
+  startDate: "2026-06-01",
+  endDate: "2026-06-30",
+  metrics: ["CLICK"],
+  comparisonStartDate: "2026-05-25",
+  comparisonEndDate: "2026-05-31",
+  performanceStatus: "ON_TRACK",
+  createdAt: "2026-06-20T07:58:24.795Z",
+};
+
+/*UI 그리드 mock*/
+export const TIMELINE_GRID_MOCK: ITimelineGridData = {
+  viewUnit: "WEEK",
+  periodLabel: "30 Dec - 5 Jan",
+  columns: [
+    { day: "M", date: 30, isWeekend: false },
+    { day: "T", date: 31, isWeekend: false },
+    { day: "W", date: 1, isWeekend: false },
+    { day: "T", date: 2, isWeekend: false, isToday: true },
+    { day: "F", date: 3, isWeekend: false },
+    { day: "S", date: 4, isWeekend: true },
+    { day: "S", date: 5, isWeekend: true },
+  ],
+  bars: [
+    {
+      id: 1,
+      title: "봄 프로모션 캠페인",
+      subtitle: "Google Ads 전환",
+      provider: "GOOGLE",
+      colStart: 3.2,
+      colEnd: 9,
+      row: 1,
+      colorClass: "bg-primary-300",
+      performanceStatus: "ON_TRACK",
+    },
+    {
+      id: 2,
+      title: "리타겟팅 캠페인",
+      subtitle: "META 트래픽",
+      provider: "META",
+      colStart: 8.9,
+      colEnd: 15.3,
+      row: 2,
+      colorClass: "bg-primary-400",
+      performanceStatus: "AT_RISK",
+    },
+  ],
+};
+
+/*성과 요약 패널 mock*/
+export const TIMELINE_SUMMARY_PANEL_MOCK: ITimelineSummaryPanelData = {
+  timelineName: TIMELINE_DETAIL_MOCK.name,
+  periodLabel: "2026.06.01 ~ 2026.06.30",
+  aiSummary: TIMELINE_DETAIL_MOCK.summary,
+  metrics: [
+    { metric: "CLICK", label: "클릭", value: 3730, changeRate: 0.08 },
+    { metric: "CONVERSION", label: "전환", value: 255, changeRate: 0.12 },
+    { metric: "IMPRESSION", label: "노출", value: 136100, changeRate: 0.05 },
+    {
+      metric: "ROAS",
+      label: "ROAS",
+      value: 3.17,
+      unit: "x",
+      changeRate: -0.03,
+    },
+  ],
+  platformShare: [
+    { provider: "GOOGLE", contributionRate: 0.52 },
+    { provider: "META", contributionRate: 0.31 },
+    { provider: "NAVER", contributionRate: 0.17 },
+  ],
+};
diff --git a/src/types/timeline/ui.ts b/src/types/timeline/ui.ts
new file mode 100644
index 00000000..29b2b5ed
--- /dev/null
+++ b/src/types/timeline/ui.ts
@@ -0,0 +1,35 @@
+import type { TProviderType } from "@/types/dashboard/provider";
+import type { TTimelinePerformanceStatus } from "@/types/timeline/api";
+
+export type TTimelineViewUnit = "DAY" | "WEEK" | "MONTH";
+
+/*날짜 축 한칸*/
+export interface ITimelineGridColumn {
+  day: string;
+  date: number;
+  isWeekend: boolean;
+  isToday?: boolean;
+  /*원본 날짜*/
+  isoDate?: string;
+}
+
+/*타임라인 위 캠페인 바*/
+export interface ITimelineCampaignBar {
+  id: number;
+  title: string;
+  subtitle: string;
+  provider?: TProviderType;
+  colStart: number; //그리드 시작 위치
+  colEnd: number;
+  row: number;
+  colorClass: string;
+  performanceStatus?: TTimelinePerformanceStatus;
+}
+
+/*그리드 + 바 묶음*/
+export interface ITimelineGridData {
+  viewUnit: TTimelineViewUnit;
+  periodLabel: string;
+  columns: ITimelineGridColumn[];
+  bars: ITimelineCampaignBar[];
+}