diff --git a/inspector.go b/inspector.go
index 813661e..ac347dd 100644
--- a/inspector.go
+++ b/inspector.go
@@ -16,3 +16,65 @@ func NewInspector(opt *RedisOpt) *Inspector {
 func (i *Inspector) CurrentStats() (*Stats, error) {
 	return i.rdb.currentStats()
 }
+
+// toTaskSlice converts a taskMessage slice to a Task slice.
+func (i *Inspector) toTaskSlice(msgs []*taskMessage) []*Task {
+	var tasks []*Task
+	for _, m := range msgs {
+		tasks = append(tasks, &Task{Type: m.Type, Payload: m.Payload})
+	}
+	return tasks
+}
+
+// ListEnqueuedTasks returns a list of tasks ready to be processed.
+func (i *Inspector) ListEnqueuedTasks() ([]*Task, error) {
+	// TODO(hibiken): Support pagination.
+	msgs, err := i.rdb.listEnqueued()
+	if err != nil {
+		return nil, err
+	}
+	return i.toTaskSlice(msgs), nil
+}
+
+// ListInProgressTasks returns a list of tasks that are being processed.
+func (i *Inspector) ListInProgressTasks() ([]*Task, error) {
+	// TODO(hibiken): Support pagination.
+	msgs, err := i.rdb.listInProgress()
+	if err != nil {
+		return nil, err
+	}
+	return i.toTaskSlice(msgs), nil
+}
+
+// ListScheduledTasks returns a list of tasks that are scheduled to
+// be processed in the future.
+func (i *Inspector) ListScheduledTasks() ([]*Task, error) {
+	// TODO(hibiken): Support pagination.
+	msgs, err := i.rdb.listScheduled()
+	if err != nil {
+		return nil, err
+	}
+	return i.toTaskSlice(msgs), nil
+}
+
+// ListRetryTasks returns a list of tasks what will be retried in the
+// future.
+func (i *Inspector) ListRetryTasks() ([]*Task, error) {
+	// TODO(hibiken): Support pagination.
+	msgs, err := i.rdb.listRetry()
+	if err != nil {
+		return nil, err
+	}
+	return i.toTaskSlice(msgs), nil
+}
+
+// ListDeadTasks returns a list of tasks that have reached its
+// maximum retry limit.
+func (i *Inspector) ListDeadTasks() ([]*Task, error) {
+	// TODO(hibiken): Support pagination.
+	msgs, err := i.rdb.listDead()
+	if err != nil {
+		return nil, err
+	}
+	return i.toTaskSlice(msgs), nil
+}
diff --git a/inspector_test.go b/inspector_test.go
index bd0e544..aac32e0 100644
--- a/inspector_test.go
+++ b/inspector_test.go
@@ -114,3 +114,253 @@ func TestCurrentStats(t *testing.T) {
 		}
 	}
 }
+
+func TestListEnqueuedTasks(t *testing.T) {
+	r := setup(t)
+	inspector := &Inspector{r}
+	m1 := randomTask("send_email", "default", nil)
+	m2 := randomTask("send_email", "default", nil)
+	m3 := randomTask("gen_export", "default", nil)
+	t1 := &Task{Type: m1.Type, Payload: m1.Payload}
+	t2 := &Task{Type: m2.Type, Payload: m2.Payload}
+	t3 := &Task{Type: m3.Type, Payload: m3.Payload}
+
+	tests := []struct {
+		queued []*taskMessage
+		want   []*Task
+	}{
+		{
+			queued: []*taskMessage{m1, m2, m3},
+			want:   []*Task{t1, t2, t3},
+		},
+		{
+			queued: []*taskMessage{},
+			want:   []*Task{},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		for _, msg := range tc.queued {
+			err := r.client.LPush(defaultQueue, mustMarshal(t, msg)).Err()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		got, err := inspector.ListEnqueuedTasks()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, sortTaskOpt); diff != "" {
+			t.Errorf("(*Inspector).ListEnqueuedTasks = %v, want %v; (-want, +got)\n%s",
+				got, tc.want, diff)
+			continue
+		}
+	}
+}
+
+func TestListInProgressTasks(t *testing.T) {
+	r := setup(t)
+	inspector := &Inspector{r}
+	m1 := randomTask("send_email", "default", nil)
+	m2 := randomTask("send_email", "default", nil)
+	m3 := randomTask("gen_export", "default", nil)
+	t1 := &Task{Type: m1.Type, Payload: m1.Payload}
+	t2 := &Task{Type: m2.Type, Payload: m2.Payload}
+	t3 := &Task{Type: m3.Type, Payload: m3.Payload}
+
+	tests := []struct {
+		inProgress []*taskMessage
+		want       []*Task
+	}{
+		{
+			inProgress: []*taskMessage{m1, m2, m3},
+			want:       []*Task{t1, t2, t3},
+		},
+		{
+			inProgress: []*taskMessage{},
+			want:       []*Task{},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		for _, msg := range tc.inProgress {
+			err := r.client.LPush(inProgress, mustMarshal(t, msg)).Err()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		got, err := inspector.ListInProgressTasks()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, sortTaskOpt); diff != "" {
+			t.Errorf("(*Inspector).ListInProgressTasks = %v, want %v; (-want, +got)\n%s",
+				got, tc.want, diff)
+			continue
+		}
+	}
+}
+
+func TestListScheduledTasks(t *testing.T) {
+	r := setup(t)
+	inspector := &Inspector{r}
+	m1 := randomTask("send_email", "default", nil)
+	m2 := randomTask("send_email", "default", nil)
+	m3 := randomTask("gen_export", "default", nil)
+	t1 := &Task{Type: m1.Type, Payload: m1.Payload}
+	t2 := &Task{Type: m2.Type, Payload: m2.Payload}
+	t3 := &Task{Type: m3.Type, Payload: m3.Payload}
+
+	tests := []struct {
+		scheduled []*taskMessage
+		want      []*Task
+	}{
+		{
+			scheduled: []*taskMessage{m1, m2, m3},
+			want:      []*Task{t1, t2, t3},
+		},
+		{
+			scheduled: []*taskMessage{},
+			want:      []*Task{},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		for _, msg := range tc.scheduled {
+			err := r.client.ZAdd(scheduled, &redis.Z{Member: mustMarshal(t, msg), Score: 123}).Err()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		got, err := inspector.ListScheduledTasks()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, sortTaskOpt); diff != "" {
+			t.Errorf("(*Inspector).ListScheduledTasks = %v, want %v; (-want, +got)\n%s",
+				got, tc.want, diff)
+			continue
+		}
+	}
+}
+
+func TestListRetryTasks(t *testing.T) {
+	r := setup(t)
+	inspector := &Inspector{r}
+	m1 := randomTask("send_email", "default", nil)
+	m2 := randomTask("send_email", "default", nil)
+	m3 := randomTask("gen_export", "default", nil)
+	t1 := &Task{Type: m1.Type, Payload: m1.Payload}
+	t2 := &Task{Type: m2.Type, Payload: m2.Payload}
+	t3 := &Task{Type: m3.Type, Payload: m3.Payload}
+
+	tests := []struct {
+		retry []*taskMessage
+		want  []*Task
+	}{
+		{
+			retry: []*taskMessage{m1, m2, m3},
+			want:  []*Task{t1, t2, t3},
+		},
+		{
+			retry: []*taskMessage{},
+			want:  []*Task{},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		for _, msg := range tc.retry {
+			err := r.client.ZAdd(retry, &redis.Z{Member: mustMarshal(t, msg), Score: 123}).Err()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		got, err := inspector.ListRetryTasks()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, sortTaskOpt); diff != "" {
+			t.Errorf("(*Inspector).ListRetryTasks = %v, want %v; (-want, +got)\n%s",
+				got, tc.want, diff)
+			continue
+		}
+	}
+}
+
+func TestListDeadTasks(t *testing.T) {
+	r := setup(t)
+	inspector := &Inspector{r}
+	m1 := randomTask("send_email", "default", nil)
+	m2 := randomTask("send_email", "default", nil)
+	m3 := randomTask("gen_export", "default", nil)
+	t1 := &Task{Type: m1.Type, Payload: m1.Payload}
+	t2 := &Task{Type: m2.Type, Payload: m2.Payload}
+	t3 := &Task{Type: m3.Type, Payload: m3.Payload}
+
+	tests := []struct {
+		dead []*taskMessage
+		want []*Task
+	}{
+		{
+			dead: []*taskMessage{m1, m2, m3},
+			want: []*Task{t1, t2, t3},
+		},
+		{
+			dead: []*taskMessage{},
+			want: []*Task{},
+		},
+	}
+
+	for _, tc := range tests {
+		// clean up db before each test case.
+		if err := r.client.FlushDB().Err(); err != nil {
+			t.Fatal(err)
+		}
+		for _, msg := range tc.dead {
+			err := r.client.ZAdd(dead, &redis.Z{Member: mustMarshal(t, msg), Score: 123}).Err()
+			if err != nil {
+				t.Fatal(err)
+			}
+		}
+
+		got, err := inspector.ListDeadTasks()
+		if err != nil {
+			t.Error(err)
+			continue
+		}
+
+		if diff := cmp.Diff(tc.want, got, sortTaskOpt); diff != "" {
+			t.Errorf("(*Inspector).ListDeadTasks = %v, want %v; (-want, +got)\n%s",
+				got, tc.want, diff)
+			continue
+		}
+	}
+}
diff --git a/rdb.go b/rdb.go
index a6b4e6b..31bceff 100644
--- a/rdb.go
+++ b/rdb.go
@@ -175,3 +175,54 @@ func (r *rdb) currentStats() (*Stats, error) {
 		Timestamp:  time.Now(),
 	}, nil
 }
+
+func (r *rdb) listEnqueued() ([]*taskMessage, error) {
+	return r.rangeList(defaultQueue)
+}
+
+func (r *rdb) listInProgress() ([]*taskMessage, error) {
+	return r.rangeList(inProgress)
+}
+
+func (r *rdb) listScheduled() ([]*taskMessage, error) {
+	return r.rangeZSet(scheduled)
+}
+
+func (r *rdb) listRetry() ([]*taskMessage, error) {
+	return r.rangeZSet(retry)
+}
+
+func (r *rdb) listDead() ([]*taskMessage, error) {
+	return r.rangeZSet(dead)
+}
+
+func (r *rdb) rangeList(key string) ([]*taskMessage, error) {
+	data, err := r.client.LRange(key, 0, -1).Result()
+	if err != nil {
+		return nil, err
+	}
+	return r.toMessageSlice(data), nil
+}
+
+func (r *rdb) rangeZSet(key string) ([]*taskMessage, error) {
+	data, err := r.client.ZRange(key, 0, -1).Result()
+	if err != nil {
+		return nil, err
+	}
+	return r.toMessageSlice(data), nil
+}
+
+// toMessageSlice convers json strings to a slice of task messages.
+func (r *rdb) toMessageSlice(data []string) []*taskMessage {
+	var msgs []*taskMessage
+	for _, s := range data {
+		var msg taskMessage
+		err := json.Unmarshal([]byte(s), &msg)
+		if err != nil {
+			// bad data; ignore and continue
+			continue
+		}
+		msgs = append(msgs, &msg)
+	}
+	return msgs
+}