diff --git a/src/formatter/phrases.ts b/src/formatter/phrases.ts
index 92276e4..56db73a 100644
--- a/src/formatter/phrases.ts
+++ b/src/formatter/phrases.ts
@@ -103,6 +103,8 @@ const alterActionPhrases: Phrase[] = action(
   ["Drop", "Partition", "List"],
   ["Set"],
   ["Squash"],
+  ["Force", "Drop", "Partition", "List"],
+  ["Force", "Reindex", "Parquet"],
   ["Dedup"],
   ["Resume", "Wal"],
   ["Suspend", "Wal"],
diff --git a/src/parser/ast.ts b/src/parser/ast.ts
index 71bd539..e131baf 100644
--- a/src/parser/ast.ts
+++ b/src/parser/ast.ts
@@ -554,6 +554,8 @@ export type AlterTableAction =
   | AttachPartitionAction
   | DetachPartitionAction
   | SquashPartitionsAction
+  | ForceDropPartitionAction
+  | ForceReindexParquetAction
   | SetParamAction
   | SetTtlAction
   | SetTableFormatAction
@@ -628,6 +630,17 @@ export interface SquashPartitionsAction {
   actionType: "squashPartitions"
 }
 
+export interface ForceDropPartitionAction {
+  actionType: "forceDropPartition"
+  partitions: string[]
+}
+
+export interface ForceReindexParquetAction {
+  actionType: "forceReindexParquet"
+  column?: string
+  partitions?: string[]
+}
+
 export interface SetParamAction {
   actionType: "setParam"
   params: TableParam[]
diff --git a/src/parser/cst-types.d.ts b/src/parser/cst-types.d.ts
index fdb40df..7f18956 100644
--- a/src/parser/cst-types.d.ts
+++ b/src/parser/cst-types.d.ts
@@ -1538,6 +1538,7 @@ export type AlterTableActionCstChildren = {
   Detach?: IToken[];
   Squash?: IToken[];
   Partitions?: IToken[];
+  alterTableForceAction?: AlterTableForceActionCstNode[];
   Param?: IToken[];
   tableParam?: (TableParamCstNode)[];
   Ttl?: IToken[];
@@ -1566,6 +1567,24 @@ export type AlterTableActionCstChildren = {
   convertPartitionTarget?: ConvertPartitionTargetCstNode[];
 };
 
+export interface AlterTableForceActionCstNode extends CstNode {
+  name: "alterTableForceAction";
+  children: AlterTableForceActionCstChildren;
+}
+
+export type AlterTableForceActionCstChildren = {
+  Force: IToken[];
+  Drop?: IToken[];
+  Partition?: (IToken)[];
+  List?: (IToken)[];
+  StringLiteral?: (IToken)[];
+  Comma?: (IToken)[];
+  Reindex?: IToken[];
+  Parquet?: IToken[];
+  Column?: IToken[];
+  identifier?: IdentifierCstNode[];
+};
+
 export interface ConvertPartitionTargetCstNode extends CstNode {
   name: "convertPartitionTarget";
   children: ConvertPartitionTargetCstChildren;
@@ -3051,6 +3070,7 @@ export interface ICstNodeVisitor<IN, OUT> extends ICstVisitor<IN, OUT> {
   memoryLimit(children: MemoryLimitCstChildren, param?: IN): OUT;
   alterTableStatement(children: AlterTableStatementCstChildren, param?: IN): OUT;
   alterTableAction(children: AlterTableActionCstChildren, param?: IN): OUT;
+  alterTableForceAction(children: AlterTableForceActionCstChildren, param?: IN): OUT;
   convertPartitionTarget(children: ConvertPartitionTargetCstChildren, param?: IN): OUT;
   alterMaterializedViewStatement(children: AlterMaterializedViewStatementCstChildren, param?: IN): OUT;
   alterMaterializedViewAction(children: AlterMaterializedViewActionCstChildren, param?: IN): OUT;
diff --git a/src/parser/parser.ts b/src/parser/parser.ts
index d6b90da..65d9557 100644
--- a/src/parser/parser.ts
+++ b/src/parser/parser.ts
@@ -2926,6 +2926,8 @@ class QuestDBParser extends CstParser {
           this.CONSUME(Partitions)
         },
       },
+      // FORCE (DROP PARTITION LIST ... | REINDEX PARQUET ...)
+      { ALT: () => this.SUBRULE(this.alterTableForceAction) },
       // SET (PARAM ... | TTL ... | TYPE WAL ... | STORAGE POLICY ...)
       {
         ALT: () => {
@@ -3066,6 +3068,45 @@ class QuestDBParser extends CstParser {
     ])
   })
 
+  // FORCE DROP PARTITION LIST '<p>' [, ...]
+  // FORCE REINDEX PARQUET [COLUMN <col>] [PARTITION LIST '<p>' [, ...]]
+  private alterTableForceAction = this.RULE("alterTableForceAction", () => {
+    this.CONSUME(Force)
+    this.OR([
+      {
+        ALT: () => {
+          this.CONSUME(Drop)
+          this.CONSUME(Partition)
+          this.CONSUME(List)
+          this.CONSUME(StringLiteral)
+          this.MANY(() => {
+            this.CONSUME(Comma)
+            this.CONSUME1(StringLiteral)
+          })
+        },
+      },
+      {
+        ALT: () => {
+          this.CONSUME(Reindex)
+          this.CONSUME(Parquet)
+          this.OPTION(() => {
+            this.CONSUME(Column)
+            this.SUBRULE(this.identifier)
+          })
+          this.OPTION1(() => {
+            this.CONSUME1(Partition)
+            this.CONSUME1(List)
+            this.CONSUME2(StringLiteral)
+            this.MANY1(() => {
+              this.CONSUME1(Comma)
+              this.CONSUME3(StringLiteral)
+            })
+          })
+        },
+      },
+    ])
+  })
+
   private convertPartitionTarget = this.RULE("convertPartitionTarget", () => {
     // Optional LIST before TO
     this.OPTION(() => {
diff --git a/src/parser/toSql.ts b/src/parser/toSql.ts
index 53af9c3..83cc8ed 100644
--- a/src/parser/toSql.ts
+++ b/src/parser/toSql.ts
@@ -964,6 +964,21 @@ function alterTableToSql(stmt: AST.AlterTableStatement): string {
     case "squashPartitions":
       parts.push("SQUASH PARTITIONS")
       break
+    case "forceDropPartition":
+      parts.push("FORCE DROP PARTITION LIST")
+      parts.push(action.partitions.map((p) => escapeString(p)).join(", "))
+      break
+    case "forceReindexParquet":
+      parts.push("FORCE REINDEX PARQUET")
+      if (action.column) {
+        parts.push("COLUMN")
+        parts.push(escapeIdentifier(action.column))
+      }
+      if (action.partitions && action.partitions.length > 0) {
+        parts.push("PARTITION LIST")
+        parts.push(action.partitions.map((p) => escapeString(p)).join(", "))
+      }
+      break
     case "setParam":
       parts.push("SET PARAM")
       parts.push(
diff --git a/src/parser/visitor.ts b/src/parser/visitor.ts
index 00bba98..2fa69e4 100644
--- a/src/parser/visitor.ts
+++ b/src/parser/visitor.ts
@@ -19,6 +19,7 @@ import type {
   AlterServiceAccountStatementCstChildren,
   AlterStatementCstChildren,
   AlterTableActionCstChildren,
+  AlterTableForceActionCstChildren,
   AlterTableStatementCstChildren,
   AlterUserActionCstChildren,
   AlterUserStatementCstChildren,
@@ -2374,7 +2375,32 @@ class QuestDBVisitor extends BaseVisitor {
     return ctx.NumberLiteral![0].image + (ctx.Identifier?.[0]?.image ?? "")
   }
 
+  alterTableForceAction(
+    ctx: AlterTableForceActionCstChildren,
+  ): AST.ForceDropPartitionAction | AST.ForceReindexParquetAction {
+    const partitions = (ctx.StringLiteral ?? []).map((s: IToken) =>
+      s.image.slice(1, -1),
+    )
+    if (ctx.Drop) {
+      return { actionType: "forceDropPartition", partitions }
+    }
+    const result: AST.ForceReindexParquetAction = {
+      actionType: "forceReindexParquet",
+    }
+    if (ctx.identifier) {
+      result.column = this.extractIdentifierName(ctx.identifier[0].children)
+    }
+    if (partitions.length > 0) {
+      result.partitions = partitions
+    }
+    return result
+  }
+
   alterTableAction(ctx: AlterTableActionCstChildren): AST.AlterTableAction {
+    // FORCE DROP PARTITION / FORCE REINDEX PARQUET
+    if (ctx.alterTableForceAction) {
+      return this.visit(ctx.alterTableForceAction) as AST.AlterTableAction
+    }
     // SET STORAGE POLICY(...) — must come before generic SET branches below
     if (ctx.Set && ctx.storagePolicy) {
       return {
diff --git a/tests/fixtures/docs-queries.json b/tests/fixtures/docs-queries.json
index f59df5d..d44ce80 100644
--- a/tests/fixtures/docs-queries.json
+++ b/tests/fixtures/docs-queries.json
@@ -7978,5 +7978,14 @@
   },
   {
     "query": "SELECT avg(b.bid) AS avg_bid, avg(a.ask) AS avg_ask FROM trades AS t HORIZON JOIN bids AS b ON (t.sym = b.sym) HORIZON JOIN asks AS a ON (t.sym = a.sym) RANGE FROM -1s TO 1s STEP 1s AS h"
+  },
+  {
+    "query": "ALTER TABLE trades FORCE REINDEX PARQUET"
+  },
+  {
+    "query": "ALTER TABLE trades FORCE REINDEX PARQUET COLUMN symbol"
+  },
+  {
+    "query": "ALTER TABLE trades FORCE REINDEX PARQUET COLUMN symbol PARTITION LIST '2026-03-01', '2026-03-02'"
   }
 ]
diff --git a/tests/formatter/fixtures.ts b/tests/formatter/fixtures.ts
index cc47e98..7892615 100644
--- a/tests/formatter/fixtures.ts
+++ b/tests/formatter/fixtures.ts
@@ -75,6 +75,23 @@ export const fixtures: Fixture[] = [
     input: "ALTER TABLE t SUSPEND WAL",
     expected: ["ALTER TABLE t", "SUSPEND WAL"].join("\n"),
   },
+  {
+    name: "ALTER TABLE FORCE REINDEX PARQUET starts a line",
+    input:
+      "ALTER TABLE trades FORCE REINDEX PARQUET COLUMN symbol PARTITION LIST '2026-03-01'",
+    expected: [
+      "ALTER TABLE trades",
+      "FORCE REINDEX PARQUET COLUMN symbol PARTITION LIST '2026-03-01'",
+    ].join("\n"),
+  },
+  {
+    name: "ALTER TABLE FORCE DROP PARTITION starts a line",
+    input: "ALTER TABLE trades FORCE DROP PARTITION LIST '2026-03-01'",
+    expected: [
+      "ALTER TABLE trades",
+      "FORCE DROP PARTITION LIST '2026-03-01'",
+    ].join("\n"),
+  },
   {
     name: "ALTER TABLE DROP STORAGE POLICY starts a line",
     input: "ALTER TABLE t DROP STORAGE POLICY",
diff --git a/tests/parser.test.ts b/tests/parser.test.ts
index 1f37533..300c076 100644
--- a/tests/parser.test.ts
+++ b/tests/parser.test.ts
@@ -7973,6 +7973,60 @@ orders PIVOT (sum(amount) FOR status IN ('open'))`
     })
   })
 
+  describe("FORCE REINDEX PARQUET / FORCE DROP PARTITION — parse & AST", () => {
+    it("bare FORCE REINDEX PARQUET", () => {
+      const r = parseToAst("ALTER TABLE t FORCE REINDEX PARQUET")
+      expect(r.errors).toHaveLength(0)
+      const s = r.ast[0] as AST.AlterTableStatement
+      expect(s.action).toEqual({ actionType: "forceReindexParquet" })
+    })
+    it("FORCE REINDEX PARQUET with COLUMN and PARTITION LIST", () => {
+      const r = parseToAst(
+        "ALTER TABLE t FORCE REINDEX PARQUET COLUMN b PARTITION LIST '2024-01-01', '2024-01-02'",
+      )
+      expect(r.errors).toHaveLength(0)
+      const s = r.ast[0] as AST.AlterTableStatement
+      expect(s.action).toEqual({
+        actionType: "forceReindexParquet",
+        column: "b",
+        partitions: ["2024-01-01", "2024-01-02"],
+      })
+    })
+    it("FORCE REINDEX PARQUET with PARTITION LIST only", () => {
+      const r = parseToAst(
+        "ALTER TABLE t FORCE REINDEX PARQUET PARTITION LIST '2024-01-01'",
+      )
+      expect(r.errors).toHaveLength(0)
+      const s = r.ast[0] as AST.AlterTableStatement
+      expect(s.action).toEqual({
+        actionType: "forceReindexParquet",
+        partitions: ["2024-01-01"],
+      })
+    })
+    it("FORCE DROP PARTITION LIST", () => {
+      const r = parseToAst(
+        "ALTER TABLE t FORCE DROP PARTITION LIST '2024-01-01', '2024-01-02'",
+      )
+      expect(r.errors).toHaveLength(0)
+      const s = r.ast[0] as AST.AlterTableStatement
+      expect(s.action).toEqual({
+        actionType: "forceDropPartition",
+        partitions: ["2024-01-01", "2024-01-02"],
+      })
+    })
+    it("rejects FORCE REINDEX without PARQUET", () => {
+      expect(
+        parseToAst("ALTER TABLE t FORCE REINDEX COLUMN b").errors.length,
+      ).toBeGreaterThan(0)
+    })
+    it("rejects FORCE REINDEX PARQUET PARTITION without LIST", () => {
+      expect(
+        parseToAst("ALTER TABLE t FORCE REINDEX PARQUET PARTITION '2024-01-01'")
+          .errors.length,
+      ).toBeGreaterThan(0)
+    })
+  })
+
   describe("SHOW CREATE DATABASE — parse & AST", () => {
     it("bare", () => {
       const s = parseToAst("SHOW CREATE DATABASE").ast[0] as AST.ShowStatement
@@ -8302,6 +8356,25 @@ orders PIVOT (sum(amount) FOR status IN ('open'))`
     }
   })
 
+  describe("FORCE REINDEX PARQUET (QuestDB #8139) — round-trip", () => {
+    const queries = [
+      "alter table t force reindex parquet",
+      "alter table t force reindex parquet column b",
+      "alter table t force reindex parquet partition list '2024-01-01', '2024-01-02'",
+      "alter table t force reindex parquet column b partition list '2024-01-02'",
+      "alter table t force drop partition list '2024-01-01', '2024-01-02'",
+    ]
+    for (const query of queries) {
+      it(`round-trips: ${query.slice(0, 64)}`, () => {
+        const r = parseToAst(query)
+        expect(r.errors, JSON.stringify(r.errors)).toHaveLength(0)
+        const r2 = parseToAst(toSql(r.ast[0]))
+        expect(r2.errors).toHaveLength(0)
+        expect(r2.ast[0]).toEqual(r.ast[0])
+      })
+    }
+  })
+
   describe("SHOW CREATE DATABASE (QuestDB #7232) — round-trip", () => {
     const queries = [
       "SHOW CREATE DATABASE",