diff --git a/src/backend/src/controllers/projects.controllers.ts b/src/backend/src/controllers/projects.controllers.ts
index 438b02005b..c3a587cf84 100644
--- a/src/backend/src/controllers/projects.controllers.ts
+++ b/src/backend/src/controllers/projects.controllers.ts
@@ -16,7 +16,11 @@ import BillOfMaterialsService from '../services/boms.services.js';
 export default class ProjectsController {
   static async getAllProjectsGantt(req: Request, res: Response, next: NextFunction) {
     try {
-      const projects: ProjectGantt[] = await ProjectsService.getAllProjectsGantt(req.organization);
+      const { carId } = req.query;
+      const projects: ProjectGantt[] = await ProjectsService.getAllProjectsGantt(
+        req.organization,
+        carId as string | undefined
+      );
       res.status(200).json(projects);
     } catch (error: unknown) {
       next(error);
@@ -25,7 +29,8 @@ export default class ProjectsController {
 
   static async getAllProjects(req: Request, res: Response, next: NextFunction) {
     try {
-      const projects: ProjectPreview[] = await ProjectsService.getAllProjects(req.organization);
+      const { carId } = req.query;
+      const projects: ProjectPreview[] = await ProjectsService.getAllProjects(req.organization, carId as string | undefined);
       res.status(200).json(projects);
     } catch (error: unknown) {
       next(error);
@@ -34,7 +39,12 @@ export default class ProjectsController {
 
   static async getUsersTeamsProjects(req: Request, res: Response, next: NextFunction) {
     try {
-      const projects: ProjectOverview[] = await ProjectsService.getUsersTeamsProjects(req.currentUser, req.organization);
+      const { carId } = req.query;
+      const projects: ProjectOverview[] = await ProjectsService.getUsersTeamsProjects(
+        req.currentUser,
+        req.organization,
+        carId as string | undefined
+      );
       res.status(200).json(projects);
     } catch (error: unknown) {
       next(error);
@@ -43,7 +53,12 @@ export default class ProjectsController {
 
   static async getUsersLeadingProjects(req: Request, res: Response, next: NextFunction) {
     try {
-      const projects: ProjectOverview[] = await ProjectsService.getUsersLeadingProjects(req.currentUser, req.organization);
+      const { carId } = req.query;
+      const projects: ProjectOverview[] = await ProjectsService.getUsersLeadingProjects(
+        req.currentUser,
+        req.organization,
+        carId as string | undefined
+      );
       res.status(200).json(projects);
     } catch (error: unknown) {
       next(error);
@@ -53,7 +68,12 @@ export default class ProjectsController {
   static async getTeamsProjects(req: Request, res: Response, next: NextFunction) {
     try {
       const { teamId } = req.params as Record<string, string>;
-      const projects: Project[] = await ProjectsService.getTeamsProjects(req.organization, teamId);
+      const { carId } = req.query;
+      const projects: Project[] = await ProjectsService.getTeamsProjects(
+        req.organization,
+        teamId,
+        carId as string | undefined
+      );
       res.status(200).json(projects);
     } catch (error: unknown) {
       next(error);
diff --git a/src/backend/src/services/projects.services.ts b/src/backend/src/services/projects.services.ts
index 44cda2e7cc..b6cfd74db9 100644
--- a/src/backend/src/services/projects.services.ts
+++ b/src/backend/src/services/projects.services.ts
@@ -47,11 +47,12 @@ export default class ProjectsService {
   /**
    * Get all the non deleted projects in the database for the given organization
    * @param organization the organization the user is currently in
+   * @param carId optional car id to filter projects by
    * @returns all the projects with query args for use in the gantt chart
    */
-  static async getAllProjectsGantt(organization: Organization): Promise<ProjectGantt[]> {
+  static async getAllProjectsGantt(organization: Organization, carId?: string): Promise<ProjectGantt[]> {
     const projects = await prisma.project.findMany({
-      where: { wbsElement: { dateDeleted: null, organizationId: organization.organizationId } },
+      where: { wbsElement: { dateDeleted: null, organizationId: organization.organizationId }, ...(carId && { carId }) },
       ...getProjectGanttQueryArgs(organization.organizationId)
     });
 
@@ -61,11 +62,12 @@ export default class ProjectsService {
   /**
    * Get all projects for given organization
    * @param organization the organization the user is in
+   * @param carId optional car id to filter projects by
    * @returns all the projects with preview query args
    */
-  static async getAllProjects(organization: Organization): Promise<ProjectPreview[]> {
+  static async getAllProjects(organization: Organization, carId?: string): Promise<ProjectPreview[]> {
     const projects = await prisma.project.findMany({
-      where: { wbsElement: { dateDeleted: null, organizationId: organization.organizationId } },
+      where: { wbsElement: { dateDeleted: null, organizationId: organization.organizationId }, ...(carId && { carId }) },
       ...getProjectPreviewQueryArgs(organization.organizationId)
     });
 
@@ -76,16 +78,18 @@ export default class ProjectsService {
    * Get all projects that the user is the lead or manager of
    * @param user the user making the request
    * @param organization the oranization the user is in
+   * @param carId optional car id to filter projects by
    * @returns the projects the user is a lead or manager of with preview query args
    */
-  static async getUsersLeadingProjects(user: User, organization: Organization): Promise<ProjectOverview[]> {
+  static async getUsersLeadingProjects(user: User, organization: Organization, carId?: string): Promise<ProjectOverview[]> {
     const projects = await prisma.project.findMany({
       where: {
         wbsElement: {
           organizationId: organization.organizationId,
           dateDeleted: null,
           OR: [{ leadId: user.userId }, { managerId: user.userId }]
-        }
+        },
+        ...(carId && { carId })
       },
       ...getProjectOverviewQueryArgs(organization.organizationId)
     });
@@ -97,9 +101,10 @@ export default class ProjectsService {
    * Get all projects related to teams the user is on
    * @param user the user making the request
    * @param organization the organization the user is in
+   * @param carId optional car id to filter projects by
    * @returns all projects associated with teams the user is on with overview card query args
    */
-  static async getUsersTeamsProjects(user: User, organization: Organization): Promise<ProjectOverview[]> {
+  static async getUsersTeamsProjects(user: User, organization: Organization, carId?: string): Promise<ProjectOverview[]> {
     const projects = await prisma.project.findMany({
       where: {
         wbsElement: {
@@ -128,7 +133,8 @@ export default class ProjectsService {
               }
             ]
           }
-        }
+        },
+        ...(carId && { carId })
       },
       ...getProjectOverviewQueryArgs(organization.organizationId)
     });
@@ -140,9 +146,10 @@ export default class ProjectsService {
    * Get the projects for a given team
    * @param organization
    * @param teamId
+   * @param carId optional car id to filter projects by
    * @returns all the projects for the given team with full project query args
    */
-  static async getTeamsProjects(organization: Organization, teamId: string): Promise<Project[]> {
+  static async getTeamsProjects(organization: Organization, teamId: string, carId?: string): Promise<Project[]> {
     const projects = await prisma.project.findMany({
       where: {
         wbsElement: {
@@ -153,7 +160,8 @@ export default class ProjectsService {
           some: {
             teamId
           }
-        }
+        },
+        ...(carId && { carId })
       },
       ...getProjectQueryArgs(organization.organizationId)
     });
diff --git a/src/frontend/src/apis/projects.api.ts b/src/frontend/src/apis/projects.api.ts
index e5d3ce62a4..b9b2650ee3 100644
--- a/src/frontend/src/apis/projects.api.ts
+++ b/src/frontend/src/apis/projects.api.ts
@@ -29,8 +29,9 @@ import { CreateSingleProjectPayload, EditSingleProjectPayload } from '../utils/t
 /**
  * Fetches all projects with querry args needed for Gantt chart
  */
-export const getAllProjectsGantt = () => {
+export const getAllProjectsGantt = (carId?: string) => {
   return axios.get<ProjectGantt[]>(apiUrls.allProjectsGantt(), {
+    params: { carId },
     transformResponse: (data) => JSON.parse(data).map(projectGanttTransformer)
   });
 };
@@ -38,8 +39,9 @@ export const getAllProjectsGantt = () => {
 /**
  * Fetches all projects with preview querry args
  */
-export const getAllProjects = () => {
+export const getAllProjects = (carId?: string) => {
   return axios.get<ProjectPreview[]>(apiUrls.allProjectPreviews(), {
+    params: { carId },
     transformResponse: (data) => JSON.parse(data).map(projectPreviewTransformer)
   });
 };
@@ -47,8 +49,9 @@ export const getAllProjects = () => {
 /**
  * Fetches all the projects that are on the users teams
  */
-export const getUsersTeamsProjects = () => {
+export const getUsersTeamsProjects = (carId?: string) => {
   return axios.get<ProjectOverview[]>(apiUrls.usersTeamsProjects(), {
+    params: { carId },
     transformResponse: (data) => JSON.parse(data).map(projectOverviewTransformer)
   });
 };
@@ -56,8 +59,9 @@ export const getUsersTeamsProjects = () => {
 /**
  * Fetches all projects that the user is the manager or lead of.
  */
-export const getUsersLeadingProjects = () => {
+export const getUsersLeadingProjects = (carId?: string) => {
   return axios.get<ProjectOverview[]>(apiUrls.usersLeadingProjects(), {
+    params: { carId },
     transformResponse: (data) => JSON.parse(data).map(projectOverviewTransformer)
   });
 };