diff --git a/src/services/team.service.ts b/src/services/team.service.ts
new file mode 100644
index 0000000..1705154
--- /dev/null
+++ b/src/services/team.service.ts
@@ -0,0 +1,57 @@
+import type { Prisma } from "@/generated/prisma/client"
+import prisma from "@/lib/prisma"
+import type { Team, TeamSummary } from "@/types"
+
+export const TeamService = {
+  findAll: async (
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<TeamSummary[]> => {
+    return db.team.findMany({
+      select: {
+        id: true,
+        name: true,
+      },
+      orderBy: { name: "asc" },
+    })
+  },
+
+  findById: async (
+    id: string,
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<Team | null> => {
+    return db.team.findUnique({ where: { id } })
+  },
+
+  findByNameCaseInsensitive: async (
+    name: string,
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<Team | null> => {
+    return db.team.findFirst({
+      where: {
+        name: { equals: name.trim(), mode: "insensitive" },
+      },
+    })
+  },
+
+  create: async (
+    data: Prisma.TeamCreateInput,
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<Team> => {
+    return db.team.create({ data })
+  },
+
+  update: async (
+    id: string,
+    data: Prisma.TeamUpdateInput,
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<Team> => {
+    return db.team.update({ where: { id }, data })
+  },
+
+  delete: async (
+    id: string,
+    db: Prisma.TransactionClient | typeof prisma = prisma,
+  ): Promise<Team> => {
+    return db.team.delete({ where: { id } })
+  },
+}
diff --git a/src/types/index.ts b/src/types/index.ts
index 805b46c..fad6ccd 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -6,4 +6,5 @@ export * from "./item"
 export * from "./movement"
 export * from "./paginate"
 export * from "./person"
+export * from "./team"
 export * from "./user"
diff --git a/src/types/team.ts b/src/types/team.ts
new file mode 100644
index 0000000..d7f4fba
--- /dev/null
+++ b/src/types/team.ts
@@ -0,0 +1,5 @@
+import type { Team as PrismaTeam } from "@/generated/prisma/client"
+
+export type Team = PrismaTeam
+
+export type TeamSummary = Pick<Team, "id" | "name">
diff --git a/src/use-cases/team.use-cases.ts b/src/use-cases/team.use-cases.ts
new file mode 100644
index 0000000..2241ac0
--- /dev/null
+++ b/src/use-cases/team.use-cases.ts
@@ -0,0 +1,123 @@
+import { Prisma } from "@/generated/prisma/client"
+import prisma from "@/lib/prisma"
+import type {
+  CreateTeamFormType,
+  UpdateTeamFormType,
+} from "@/schemas/team.schema"
+import { TeamService } from "@/services/team.service"
+
+type FieldErrors = Record<string, string[]>
+
+type TeamUseCaseResult =
+  | {
+      success: true
+    }
+  | {
+      success: false
+      errors: FieldErrors
+    }
+
+function teamError(errors: FieldErrors): TeamUseCaseResult {
+  return {
+    success: false,
+    errors,
+  }
+}
+
+function isUniqueConstraintError(error: unknown) {
+  return (
+    error instanceof Prisma.PrismaClientKnownRequestError &&
+    error.code === "P2002"
+  )
+}
+
+export async function listTeamsUseCase() {
+  return TeamService.findAll()
+}
+
+export async function createTeamUseCase(
+  input: CreateTeamFormType,
+): Promise<TeamUseCaseResult> {
+  const name = input.name.trim()
+
+  try {
+    return await prisma.$transaction(async (tx) => {
+      const existingTeam = await TeamService.findByNameCaseInsensitive(name, tx)
+
+      if (existingTeam) {
+        return teamError({ name: ["Team already exists"] })
+      }
+
+      await TeamService.create({ name }, tx)
+
+      return { success: true }
+    })
+  } catch (error) {
+    if (isUniqueConstraintError(error)) {
+      return teamError({ name: ["Team already exists"] })
+    }
+
+    throw error
+  }
+}
+
+export async function updateTeamUseCase(
+  input: UpdateTeamFormType,
+): Promise<TeamUseCaseResult> {
+  const { id } = input
+  const name = input.name.trim()
+
+  try {
+    return await prisma.$transaction(async (tx) => {
+      const existingTeam = await TeamService.findById(id, tx)
+
+      if (!existingTeam) {
+        return teamError({ id: ["Team not found"] })
+      }
+
+      if (existingTeam.name.toLowerCase() === name.toLowerCase()) {
+        return teamError({ name: ["Team name is the same"] })
+      }
+
+      const teamWithName = await TeamService.findByNameCaseInsensitive(name, tx)
+
+      if (teamWithName) {
+        return teamError({ name: ["Team already exists"] })
+      }
+
+      await TeamService.update(id, { name }, tx)
+
+      return { success: true }
+    })
+  } catch (error) {
+    if (isUniqueConstraintError(error)) {
+      return teamError({ name: ["Team already exists"] })
+    }
+
+    throw error
+  }
+}
+
+export async function deleteTeamUseCase(
+  id: string,
+): Promise<TeamUseCaseResult> {
+  try {
+    return await prisma.$transaction(async (tx) => {
+      const team = await TeamService.findById(id, tx)
+
+      if (!team) {
+        return teamError({ id: ["Team not found"] })
+      }
+
+      await TeamService.delete(id, tx)
+
+      return { success: true }
+    })
+  } catch (error) {
+    if (isUniqueConstraintError(error)) {
+      return teamError({ name: ["Team already exists"] })
+    }
+
+    throw error
+  }
+}
diff --git a/tests/integration/helpers/factories.ts b/tests/integration/helpers/factories.ts
index 07068c7..e05ca0e 100644
--- a/tests/integration/helpers/factories.ts
+++ b/tests/integration/helpers/factories.ts
@@ -77,6 +77,19 @@ export async function createTestPerson(
   })
 }
 
+export async function createTestTeam(
+  prisma: PrismaClient,
+  overrides: Partial<{ name: string }> = {},
+) {
+  const suffix = nextSuffix()
+
+  return prisma.team.create({
+    data: {
+      name: overrides.name ?? `Test Team ${suffix}`,
+    },
+  })
+}
+
 export async function createTestItem(
   prisma: PrismaClient,
   overrides: Partial<{
diff --git a/tests/integration/helpers/test-db.ts b/tests/integration/helpers/test-db.ts
index 3593111..d722a94 100644
--- a/tests/integration/helpers/test-db.ts
+++ b/tests/integration/helpers/test-db.ts
@@ -18,6 +18,7 @@ const TABLES_TO_TRUNCATE = [
   "Asset",
   "Item",
   "Category",
+  "Team",
   "Person",
   "User",
 ]
diff --git a/tests/integration/use-cases/team.use-cases.test.ts b/tests/integration/use-cases/team.use-cases.test.ts
new file mode 100644
index 0000000..76022ba
--- /dev/null
+++ b/tests/integration/use-cases/team.use-cases.test.ts
@@ -0,0 +1,175 @@
+import { afterAll, beforeAll, beforeEach, describe, expect, it } from "vitest"
+import type { PrismaClient } from "@/generated/prisma/client"
+import { createTestPerson, createTestTeam } from "../helpers/factories"
+import {
+  resetIntegrationTestDatabase,
+  startIntegrationTestDatabase,
+  stopIntegrationTestDatabase,
+} from "../helpers/test-db"
+
+let prisma: PrismaClient
+let createTeamUseCase: typeof import("@/use-cases/team.use-cases").createTeamUseCase
+let updateTeamUseCase: typeof import("@/use-cases/team.use-cases").updateTeamUseCase
+let deleteTeamUseCase: typeof import("@/use-cases/team.use-cases").deleteTeamUseCase
+let listTeamsUseCase: typeof import("@/use-cases/team.use-cases").listTeamsUseCase
+let TeamService: typeof import("@/services/team.service").TeamService
+
+beforeAll(async () => {
+  await startIntegrationTestDatabase()
+
+  const prismaModule = await import("@/lib/prisma")
+  const teamUseCases = await import("@/use-cases/team.use-cases")
+  const teamService = await import("@/services/team.service")
+
+  prisma = prismaModule.prisma
+  createTeamUseCase = teamUseCases.createTeamUseCase
+  updateTeamUseCase = teamUseCases.updateTeamUseCase
+  deleteTeamUseCase = teamUseCases.deleteTeamUseCase
+  listTeamsUseCase = teamUseCases.listTeamsUseCase
+  TeamService = teamService.TeamService
+})
+
+beforeEach(async () => {
+  await resetIntegrationTestDatabase(prisma)
+})
+
+afterAll(async () => {
+  await prisma?.$disconnect()
+  await stopIntegrationTestDatabase()
+})
+
+describe("team use-cases", () => {
+  it("creates a team and rejects duplicate names", async () => {
+    expect(await createTeamUseCase({ name: "Engineering" })).toEqual({
+      success: true,
+    })
+
+    expect(
+      await prisma.team.findFirst({ where: { name: "Engineering" } }),
+    ).toMatchObject({ name: "Engineering" })
+
+    expect(await createTeamUseCase({ name: "Engineering" })).toEqual({
+      success: false,
+      errors: { name: ["Team already exists"] },
+    })
+
+    expect(await prisma.team.count()).toBe(1)
+  })
+
+  it("rejects duplicate names case-insensitively and trims whitespace", async () => {
+    await createTestTeam(prisma, { name: "Engineering" })
+
+    expect(await createTeamUseCase({ name: "engineering" })).toEqual({
+      success: false,
+      errors: { name: ["Team already exists"] },
+    })
+
+    expect(await createTeamUseCase({ name: "  ENGINEERING  " })).toEqual({
+      success: false,
+      errors: { name: ["Team already exists"] },
+    })
+
+    expect(await prisma.team.count()).toBe(1)
+  })
+
+  it("trims the name before saving", async () => {
+    await createTeamUseCase({ name: "  Engineering  " })
+
+    const team = await prisma.team.findFirst({
+      where: { name: "Engineering" },
+    })
+
+    expect(team).not.toBeNull()
+    expect(team?.name).toBe("Engineering")
+  })
+
+  it("updates a team and rejects unchanged or duplicate names", async () => {
+    const team = await createTestTeam(prisma, { name: "Peripherals" })
+    const other = await createTestTeam(prisma, { name: "Networking" })
+
+    expect(
+      await updateTeamUseCase({ id: team.id, name: "Accessories" }),
+    ).toEqual({ success: true })
+
+    expect(
+      await prisma.team.findUniqueOrThrow({ where: { id: team.id } }),
+    ).toMatchObject({ name: "Accessories" })
+
+    expect(
+      await updateTeamUseCase({ id: team.id, name: "Accessories" }),
+    ).toEqual({
+      success: false,
+      errors: { name: ["Team name is the same"] },
+    })
+
+    expect(
+      await updateTeamUseCase({ id: team.id, name: other.name }),
+    ).toEqual({
+      success: false,
+      errors: { name: ["Team already exists"] },
+    })
+
+    expect(
+      await prisma.team.findUniqueOrThrow({ where: { id: team.id } }),
+    ).toMatchObject({ name: "Accessories" })
+  })
+
+  it("returns not found when updating a missing team", async () => {
+    expect(
+      await updateTeamUseCase({
+        id: "00000000-0000-0000-0000-000000000000",
+        name: "Ghost",
+      }),
+    ).toEqual({
+      success: false,
+      errors: { id: ["Team not found"] },
+    })
+  })
+
+  it("hard deletes a team", async () => {
+    const team = await createTestTeam(prisma, { name: "Legacy" })
+
+    expect(await deleteTeamUseCase(team.id)).toEqual({ success: true })
+
+    expect(await prisma.team.findUnique({ where: { id: team.id } })).toBeNull()
+  })
+
+  it("returns not found when deleting a missing team", async () => {
+    expect(
+      await deleteTeamUseCase("00000000-0000-0000-0000-000000000000"),
+    ).toEqual({
+      success: false,
+      errors: { id: ["Team not found"] },
+    })
+  })
+
+  it("nulls linked Person.teamId when a team is deleted", async () => {
+    const team = await createTestTeam(prisma, { name: "Assigned" })
+    const person = await createTestPerson(prisma)
+
+    await prisma.person.update({
+      where: { id: person.id },
+      data: { teamId: team.id },
+    })
+
+    expect(await deleteTeamUseCase(team.id)).toEqual({ success: true })
+
+    const updatedPerson = await prisma.person.findUnique({
+      where: { id: person.id },
+    })
+
+    expect(updatedPerson).not.toBeNull()
+    expect(updatedPerson?.teamId).toBeNull()
+  })
+
+  it("lists all teams ordered by name", async () => {
+    await createTestTeam(prisma, { name: "Beta" })
+    await createTestTeam(prisma, { name: "Alpha" })
+    await createTestTeam(prisma, { name: "Gamma" })
+
+    const teams = await listTeamsUseCase()
+
+    expect(teams).toHaveLength(3)
+    expect(teams.map((team) => team.name)).toEqual(["Alpha", "Beta", "Gamma"])
+  })
+})