diff --git a/internal/base/base.go b/internal/base/base.go
index 2fae65c..9735b68 100644
--- a/internal/base/base.go
+++ b/internal/base/base.go
@@ -6,6 +6,7 @@
 package base
 
 import (
+	"strings"
 	"time"
 
 	"github.com/rs/xid"
@@ -29,7 +30,7 @@ const (
 
 // QueueKey returns a redis key string for the given queue name.
 func QueueKey(qname string) string {
-	return QueuePrefix + qname
+	return QueuePrefix + strings.ToLower(qname)
 }
 
 // ProcessedKey returns a redis key string for procesed count
diff --git a/internal/rdb/inspect.go b/internal/rdb/inspect.go
index 29cb80b..f279254 100644
--- a/internal/rdb/inspect.go
+++ b/internal/rdb/inspect.go
@@ -235,8 +235,18 @@ func (r *RDB) RedisInfo() (map[string]string, error) {
 	return info, nil
 }
 
-// ListEnqueued returns all enqueued tasks that are ready to be processed.
-func (r *RDB) ListEnqueued() ([]*EnqueuedTask, error) {
+// ListEnqueued returns enqueued tasks that are ready to be processed.
+//
+// Queue names can be optionally passed to query only the specified queues.
+// If none are passed, it will query all queues.
+func (r *RDB) ListEnqueued(qnames ...string) ([]*EnqueuedTask, error) {
+	if len(qnames) == 0 {
+		return r.listAllEnqueued()
+	}
+	return r.listEnqueued(qnames...)
+}
+
+func (r *RDB) listAllEnqueued() ([]*EnqueuedTask, error) {
 	script := redis.NewScript(`
 	local res = {}
 	local queues = redis.call("SMEMBERS", KEYS[1])
@@ -256,6 +266,36 @@ func (r *RDB) ListEnqueued() ([]*EnqueuedTask, error) {
 	if err != nil {
 		return nil, err
 	}
+	return toEnqueuedTasks(data)
+}
+
+func (r *RDB) listEnqueued(qnames ...string) ([]*EnqueuedTask, error) {
+	script := redis.NewScript(`
+	local res = {}
+	for _, qkey in ipairs(KEYS) do
+		local msgs = redis.call("LRANGE", qkey, 0, -1)
+		for _, msg in ipairs(msgs) do
+			table.insert(res, msg)
+		end
+	end
+	return res
+	`)
+	var keys []string
+	for _, q := range qnames {
+		keys = append(keys, base.QueueKey(q))
+	}
+	res, err := script.Run(r.client, keys).Result()
+	if err != nil {
+		return nil, err
+	}
+	data, err := cast.ToStringSliceE(res)
+	if err != nil {
+		return nil, err
+	}
+	return toEnqueuedTasks(data)
+}
+
+func toEnqueuedTasks(data []string) ([]*EnqueuedTask, error) {
 	var tasks []*EnqueuedTask
 	for _, s := range data {
 		var msg base.TaskMessage
diff --git a/internal/rdb/inspect_test.go b/internal/rdb/inspect_test.go
index 0a6c104..53cf84d 100644
--- a/internal/rdb/inspect_test.go
+++ b/internal/rdb/inspect_test.go
@@ -234,19 +234,22 @@ func TestListEnqueued(t *testing.T) {
 	t4 := &EnqueuedTask{ID: m4.ID, Type: m4.Type, Payload: m4.Payload, Queue: m4.Queue}
 	tests := []struct {
 		enqueued map[string][]*base.TaskMessage
+		qnames   []string
 		want     []*EnqueuedTask
 	}{
 		{
 			enqueued: map[string][]*base.TaskMessage{
 				base.DefaultQueueName: {m1, m2},
 			},
-			want: []*EnqueuedTask{t1, t2},
+			qnames: []string{},
+			want:   []*EnqueuedTask{t1, t2},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
 				base.DefaultQueueName: {},
 			},
-			want: []*EnqueuedTask{},
+			qnames: []string{},
+			want:   []*EnqueuedTask{},
 		},
 		{
 			enqueued: map[string][]*base.TaskMessage{
@@ -254,7 +257,26 @@ func TestListEnqueued(t *testing.T) {
 				"critical":            {m3},
 				"low":                 {m4},
 			},
-			want: []*EnqueuedTask{t1, t2, t3, t4},
+			qnames: []string{},
+			want:   []*EnqueuedTask{t1, t2, t3, t4},
+		},
+		{
+			enqueued: map[string][]*base.TaskMessage{
+				base.DefaultQueueName: {m1, m2},
+				"critical":            {m3},
+				"low":                 {m4},
+			},
+			qnames: []string{"critical"},
+			want:   []*EnqueuedTask{t3},
+		},
+		{
+			enqueued: map[string][]*base.TaskMessage{
+				base.DefaultQueueName: {m1, m2},
+				"critical":            {m3},
+				"low":                 {m4},
+			},
+			qnames: []string{"critical", "low"},
+			want:   []*EnqueuedTask{t3, t4},
 		},
 	}
 
@@ -264,7 +286,7 @@ func TestListEnqueued(t *testing.T) {
 			h.SeedEnqueuedQueue(t, r.client, msgs, qname)
 		}
 
-		got, err := r.ListEnqueued()
+		got, err := r.ListEnqueued(tc.qnames...)
 		if err != nil {
 			t.Errorf("r.ListEnqueued() = %v, %v, want %v, nil", got, err, tc.want)
 			continue
diff --git a/tools/asynqmon/cmd/ls.go b/tools/asynqmon/cmd/ls.go
index 2014003..1440824 100644
--- a/tools/asynqmon/cmd/ls.go
+++ b/tools/asynqmon/cmd/ls.go
@@ -23,18 +23,23 @@ var lsValidArgs = []string{"enqueued", "inprogress", "scheduled", "retry", "dead
 
 // lsCmd represents the ls command
 var lsCmd = &cobra.Command{
-	Use:   "ls [queue name]",
-	Short: "Lists queue contents",
-	Long: `Ls (asynqmon ls) will list all tasks from the specified queue in a table format.
+	Use:   "ls [task state]",
+	Short: "Lists tasks in the specified state",
+	Long: `Ls (asynqmon ls) will list all tasks in the specified state in a table format.
 
-The command takes one argument which specifies the queue to inspect. The value
-of the argument should be one of "enqueued", "inprogress", "scheduled",
+The command takes one argument which specifies the state of tasks.
+The argument value should be one of "enqueued", "inprogress", "scheduled",
 "retry", or "dead".
 
-Example: asynqmon ls dead`,
-	ValidArgs: lsValidArgs,
-	Args:      cobra.ExactValidArgs(1),
-	Run:       ls,
+Example:
+asynqmon ls dead -> Lists all tasks in dead state
+
+Enqueued tasks can optionally be filtered by providing queue names after ":"
+Example:
+asynqmon ls enqueued:critical -> List tasks from critical queue only
+`,
+	Args: cobra.ExactValidArgs(1),
+	Run:  ls,
 }
 
 func init() {
@@ -57,9 +62,10 @@ func ls(cmd *cobra.Command, args []string) {
 		DB:   db,
 	})
 	r := rdb.NewRDB(c)
-	switch args[0] {
+	parts := strings.Split(args[0], ":")
+	switch parts[0] {
 	case "enqueued":
-		listEnqueued(r)
+		listEnqueued(r, parts[1:]...)
 	case "inprogress":
 		listInProgress(r)
 	case "scheduled":
@@ -69,7 +75,7 @@ func ls(cmd *cobra.Command, args []string) {
 	case "dead":
 		listDead(r)
 	default:
-		fmt.Printf("error: `asynqmon ls [queue name]` only accepts %v as the argument.\n", lsValidArgs)
+		fmt.Printf("error: `asynqmon ls [task state]` only accepts %v as the argument.\n", lsValidArgs)
 		os.Exit(1)
 	}
 }
@@ -105,14 +111,24 @@ func parseQueryID(queryID string) (id xid.ID, score int64, qtype string, err err
 	return id, score, qtype, nil
 }
 
-func listEnqueued(r *rdb.RDB) {
-	tasks, err := r.ListEnqueued()
+func listEnqueued(r *rdb.RDB, qnames ...string) {
+	tasks, err := r.ListEnqueued(qnames...)
 	if err != nil {
 		fmt.Println(err)
 		os.Exit(1)
 	}
 	if len(tasks) == 0 {
-		fmt.Println("No enqueued tasks")
+		msg := "No enqueued tasks"
+		if len(qnames) > 0 {
+			msg += " in"
+			for i, q := range qnames {
+				msg += fmt.Sprintf(" %q queue", q)
+				if i != len(qnames)-1 {
+					msg += ","
+				}
+			}
+		}
+		fmt.Println(msg)
 		return
 	}
 	cols := []string{"ID", "Type", "Payload", "Queue"}