diff --git a/internal/slurm/slurmdb_qos.go b/internal/slurm/slurmdb_qos.go
new file mode 100644
index 0000000..836f6f7
--- /dev/null
+++ b/internal/slurm/slurmdb_qos.go
@@ -0,0 +1,117 @@
+package slurm
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+)
+
+type GetQosOptions struct {
+	Description *string `url:"description,omitempty"`
+	ID          *string `url:"id,omitempty"`
+	Format      *string `url:"format,omitempty"`
+	Name        *string `url:"name,omitempty"`
+	PreemptMode *string `url:"preempt_mode,omitempty"`
+	WithDeleted *string `url:"with_deleted,omitempty"`
+}
+
+func (s *SlurmdbQosService) GetQosList(ctx context.Context, opts *GetQosOptions) (*OpenapiSlurmdbdQosResp, *Response, error) {
+	path := "slurmdb/v0.0.40/qos"
+	req, err := s.client.NewRequest("GET", path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if opts != nil {
+		u, parseErr := url.Parse(req.URL.String())
+		if parseErr != nil {
+			return nil, nil, parseErr
+		}
+		q := u.Query()
+		if opts.Description != nil {
+			q.Set("description", *opts.Description)
+		}
+		if opts.ID != nil {
+			q.Set("id", *opts.ID)
+		}
+		if opts.Format != nil {
+			q.Set("format", *opts.Format)
+		}
+		if opts.Name != nil {
+			q.Set("name", *opts.Name)
+		}
+		if opts.PreemptMode != nil {
+			q.Set("preempt_mode", *opts.PreemptMode)
+		}
+		if opts.WithDeleted != nil {
+			q.Set("with_deleted", *opts.WithDeleted)
+		}
+		u.RawQuery = q.Encode()
+		req.URL = u
+	}
+
+	var result OpenapiSlurmdbdQosResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}
+
+func (s *SlurmdbQosService) GetQos(ctx context.Context, qosName string, opts *GetQosOptions) (*OpenapiSlurmdbdQosResp, *Response, error) {
+	path := fmt.Sprintf("slurmdb/v0.0.40/qos/%s", qosName)
+	req, err := s.client.NewRequest("GET", path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	if opts != nil {
+		u, parseErr := url.Parse(req.URL.String())
+		if parseErr != nil {
+			return nil, nil, parseErr
+		}
+		q := u.Query()
+		if opts.WithDeleted != nil {
+			q.Set("with_deleted", *opts.WithDeleted)
+		}
+		u.RawQuery = q.Encode()
+		req.URL = u
+	}
+
+	var result OpenapiSlurmdbdQosResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}
+
+func (s *SlurmdbQosService) PostQos(ctx context.Context, body *OpenapiSlurmdbdQosResp) (*OpenapiSlurmdbdQosResp, *Response, error) {
+	path := "slurmdb/v0.0.40/qos"
+	req, err := s.client.NewRequest("POST", path, body)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var result OpenapiSlurmdbdQosResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}
+
+func (s *SlurmdbQosService) DeleteQos(ctx context.Context, qosName string) (*OpenapiSlurmdbdQosRemovedResp, *Response, error) {
+	path := fmt.Sprintf("slurmdb/v0.0.40/qos/%s", qosName)
+	req, err := s.client.NewRequest("DELETE", path, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	var result OpenapiSlurmdbdQosRemovedResp
+	resp, err := s.client.Do(ctx, req, &result)
+	if err != nil {
+		return nil, resp, err
+	}
+	return &result, resp, nil
+}
diff --git a/internal/slurm/slurmdb_qos_test.go b/internal/slurm/slurmdb_qos_test.go
new file mode 100644
index 0000000..5600465
--- /dev/null
+++ b/internal/slurm/slurmdb_qos_test.go
@@ -0,0 +1,185 @@
+package slurm
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+)
+
+func TestSlurmdbQosService_GetQosList(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `{"qos": []}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	resp, _, err := client.SlurmdbQos.GetQosList(context.Background(), nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+}
+
+func TestSlurmdbQosService_GetQosList_WithOptions(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		q := r.URL.Query()
+		if q.Get("description") != "test-desc" {
+			t.Errorf("expected description=test-desc, got %s", q.Get("description"))
+		}
+		if q.Get("id") != "1,2" {
+			t.Errorf("expected id=1,2, got %s", q.Get("id"))
+		}
+		if q.Get("name") != "normal,debug" {
+			t.Errorf("expected name=normal,debug, got %s", q.Get("name"))
+		}
+		if q.Get("with_deleted") != "true" {
+			t.Errorf("expected with_deleted=true, got %s", q.Get("with_deleted"))
+		}
+		fmt.Fprint(w, `{"qos": []}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	opts := &GetQosOptions{
+		Description: Ptr("test-desc"),
+		ID:          Ptr("1,2"),
+		Name:        Ptr("normal,debug"),
+		WithDeleted: Ptr("true"),
+	}
+	resp, _, err := client.SlurmdbQos.GetQosList(context.Background(), opts)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+}
+
+func TestSlurmdbQosService_GetQos(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos/normal", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		fmt.Fprint(w, `{"qos": [{"name": "normal", "description": "normal QOS"}]}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	resp, _, err := client.SlurmdbQos.GetQos(context.Background(), "normal", nil)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+	if len(resp.Qos) != 1 {
+		t.Fatalf("expected 1 qos, got %d", len(resp.Qos))
+	}
+}
+
+func TestSlurmdbQosService_GetQos_WithOptions(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos/normal", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "GET")
+		q := r.URL.Query()
+		if q.Get("with_deleted") != "true" {
+			t.Errorf("expected with_deleted=true, got %s", q.Get("with_deleted"))
+		}
+		fmt.Fprint(w, `{"qos": []}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	opts := &GetQosOptions{
+		WithDeleted: Ptr("true"),
+	}
+	resp, _, err := client.SlurmdbQos.GetQos(context.Background(), "normal", opts)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+}
+
+func TestSlurmdbQosService_PostQos(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "POST")
+		if ct := r.Header.Get("Content-Type"); ct != "application/json" {
+			t.Errorf("expected Content-Type application/json, got %s", ct)
+		}
+		fmt.Fprint(w, `{"qos": [{"name": "new-qos"}]}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	body := &OpenapiSlurmdbdQosResp{}
+	resp, _, err := client.SlurmdbQos.PostQos(context.Background(), body)
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+	if len(resp.Qos) != 1 {
+		t.Errorf("expected 1 qos, got %d", len(resp.Qos))
+	}
+}
+
+func TestSlurmdbQosService_DeleteQos(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos/old-qos", func(w http.ResponseWriter, r *http.Request) {
+		testMethod(t, r, "DELETE")
+		fmt.Fprint(w, `{"removed_qos": ["old-qos"]}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	resp, _, err := client.SlurmdbQos.DeleteQos(context.Background(), "old-qos")
+	if err != nil {
+		t.Fatalf("unexpected error: %v", err)
+	}
+	if resp == nil {
+		t.Fatal("expected non-nil response")
+	}
+	if len(resp.RemovedQos) != 1 {
+		t.Fatalf("expected 1 removed qos, got %d", len(resp.RemovedQos))
+	}
+	if resp.RemovedQos[0] != "old-qos" {
+		t.Errorf("expected removed_qos=old-qos, got %s", resp.RemovedQos[0])
+	}
+}
+
+func TestSlurmdbQosService_Error(t *testing.T) {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/slurmdb/v0.0.40/qos", func(w http.ResponseWriter, r *http.Request) {
+		w.WriteHeader(http.StatusInternalServerError)
+		fmt.Fprint(w, `{"errors": [{"error": "internal error"}]}`)
+	})
+	server := httptest.NewServer(mux)
+	defer server.Close()
+
+	client, _ := NewClient(server.URL, nil)
+	_, _, err := client.SlurmdbQos.GetQosList(context.Background(), nil)
+	if err == nil {
+		t.Fatal("expected error for 500 response")
+	}
+	if !strings.Contains(err.Error(), "500") {
+		t.Errorf("expected error to contain 500, got %v", err)
+	}
+}