diff --git a/app/graphql/mutations/upsert_project.rb b/app/graphql/mutations/upsert_project.rb
index 47d3e1d6..58160bbc 100644
--- a/app/graphql/mutations/upsert_project.rb
+++ b/app/graphql/mutations/upsert_project.rb
@@ -15,6 +15,7 @@ class UpsertProject < BaseMutation
     argument :hourly_rate, Integer, required: false, description: "The hourly rate for this project."
     argument :starts_on, GraphQL::Types::ISO8601Date, required: false, description: "The date this project starts."
     argument :ends_on, GraphQL::Types::ISO8601Date, required: false, description: "The date this project ends."
+    argument :assignments, [Types::StaffPlan::AssignmentAttributes], required: false, description: "Assignments for this project. See upsertAssignment to create a single assignment for existing projects."
 
     # return type from the mutation
     type Types::StaffPlan::ProjectType, null: true
@@ -31,7 +32,8 @@ def resolve(
       rate_type: nil,
       hourly_rate: nil,
       starts_on: nil,
-      ends_on: nil
+      ends_on: nil,
+      assignments: []
     )
       current_company = context[:current_company]
 
@@ -68,6 +70,10 @@ def resolve(
 
       if project.valid?
         project.save!
+
+        assignments.map do |assignment|
+          project.assignments << Assignment.new(assignment.to_h)
+        end
       else
         project.errors.group_by_attribute.each do |attribute, errors|
           errors.each do |error|
diff --git a/app/graphql/schema.graphql b/app/graphql/schema.graphql
index a0a89fe0..67122fdb 100644
--- a/app/graphql/schema.graphql
+++ b/app/graphql/schema.graphql
@@ -38,6 +38,41 @@ type Assignment {
   workWeeks: [WorkWeek!]!
 }
 
+"""
+Attributes for creating an assignment
+"""
+input AssignmentAttributes {
+  """
+  The date the assignment ends
+  """
+  endsOn: ISO8601Date
+
+  """
+  The estimated weekly hours for this assignment
+  """
+  estimatedWeeklyHours: Int
+
+  """
+  The project this assignment is for
+  """
+  projectId: ID
+
+  """
+  The date the assignment starts
+  """
+  startsOn: ISO8601Date
+
+  """
+  The status of the assignment
+  """
+  status: String
+
+  """
+  The user assigned to this assignment
+  """
+  userId: ID
+}
+
 enum AssignmentStatus {
   """
   The assignment is currently in progress.
@@ -181,6 +216,11 @@ type Mutation {
   Create or update a project.
   """
   upsertProject(
+    """
+    Assignments for this project. See upsertAssignment to create a single assignment for existing projects.
+    """
+    assignments: [AssignmentAttributes!]
+
     """
     The ID of the client for this project.
     """
diff --git a/app/graphql/types/staff_plan/assignment_attributes.rb b/app/graphql/types/staff_plan/assignment_attributes.rb
new file mode 100644
index 00000000..6b425c71
--- /dev/null
+++ b/app/graphql/types/staff_plan/assignment_attributes.rb
@@ -0,0 +1,10 @@
+class Types::StaffPlan::AssignmentAttributes < Types::BaseInputObject
+  description "Attributes for creating an assignment"
+
+  argument :user_id, ID, required: false, description: "The user assigned to this assignment"
+  argument :project_id, ID, required: false, description: "The project this assignment is for"
+  argument :status, String, required: false, description: "The status of the assignment"
+  argument :starts_on, GraphQL::Types::ISO8601Date, required: false, description: "The date the assignment starts"
+  argument :ends_on, GraphQL::Types::ISO8601Date, required: false, description: "The date the assignment ends"
+  argument :estimated_weekly_hours, Integer, required: false, description: "The estimated weekly hours for this assignment"
+end
\ No newline at end of file
diff --git a/spec/graphql/mutations/upsert_project_spec.rb b/spec/graphql/mutations/upsert_project_spec.rb
index 8e417eb8..ddf43cb4 100644
--- a/spec/graphql/mutations/upsert_project_spec.rb
+++ b/spec/graphql/mutations/upsert_project_spec.rb
@@ -5,10 +5,10 @@
 RSpec.describe Mutations::UpsertProject do
 
   context "resolve" do
-    it "creates a new project with valid params" do
+    it "creates a new project with assignments from valid params" do
       query_string = <<-GRAPHQL
-        mutation($clientId: ID, $name: String, $status: String) {
-          upsertProject(clientId: $clientId, name: $name, status: $status) {
+        mutation($clientId: ID, $name: String, $status: String, $assignments: [AssignmentAttributes!]) {
+          upsertProject(clientId: $clientId, name: $name, status: $status, assignments: $assignments) {
             id
             client {
               id
@@ -17,11 +17,17 @@
             status
             startsOn
             endsOn
+            assignments {
+              assignedUser {
+                email
+              }             
+            }           
           }
         }
       GRAPHQL
 
       user = create(:user)
+      assignee = create(:membership, company: user.current_company).user
       client = create(:client, company: user.current_company)
 
       result = StaffplanReduxSchema.execute(
@@ -33,7 +39,10 @@
         variables: {
           clientId: client.id,
           name: project_name = Faker::Company.buzzword,
-          status: Project::UNCONFIRMED
+          status: Project::UNCONFIRMED,
+          assignments: [{
+            userId: assignee.id,
+          }]
         }
       )
 
@@ -44,6 +53,62 @@
       expect(post_result["status"]).to eq(Project::UNCONFIRMED)
       expect(post_result["startsOn"]).to be_nil
       expect(post_result["endsOn"]).to be_nil
+      expect(post_result["assignments"].length).to eq(1)
+      expect(post_result["assignments"].first["assignedUser"]["email"]).to eq(assignee.email)
+    end
+
+    it "creates a new project with unassigned assignments from valid params" do
+      query_string = <<-GRAPHQL
+        mutation($clientId: ID, $name: String, $status: String, $assignments: [AssignmentAttributes!]) {
+          upsertProject(clientId: $clientId, name: $name, status: $status, assignments: $assignments) {
+            id
+            client {
+              id
+            }
+            name
+            status
+            startsOn
+            endsOn
+            assignments {
+              assignedUser {
+                email
+              }
+              startsOn             
+            }           
+          }
+        }
+      GRAPHQL
+
+      user = create(:user)
+      starts_on = Date.tomorrow.iso8601
+      client = create(:client, company: user.current_company)
+
+      result = StaffplanReduxSchema.execute(
+        query_string,
+        context: {
+          current_user: user,
+          current_company: user.current_company
+        },
+        variables: {
+          clientId: client.id,
+          name: project_name = Faker::Company.buzzword,
+          status: Project::UNCONFIRMED,
+          assignments: [{
+            startsOn: starts_on,
+          }]
+        }
+      )
+
+      post_result = result["data"]["upsertProject"]
+      expect(result["errors"]).to be_nil
+      expect(post_result["client"]["id"]).to eq(client.id.to_s)
+      expect(post_result["name"]).to eq(project_name)
+      expect(post_result["status"]).to eq(Project::UNCONFIRMED)
+      expect(post_result["startsOn"]).to be_nil
+      expect(post_result["endsOn"]).to be_nil
+      expect(post_result["assignments"].length).to eq(1)
+      expect(post_result["assignments"].first["assignedUser"]).to be_nil
+      expect(post_result["assignments"].first["startsOn"]).to eq(starts_on)
     end
 
     it "does not allow a client_id from another company to be specified" do