diff --git a/internal/logutils/frame.go b/internal/logutils/frame.go
index b1d3e672..6e0fd311 100644
--- a/internal/logutils/frame.go
+++ b/internal/logutils/frame.go
@@ -23,6 +23,10 @@ func ConvertFrame(frame wire.Frame) logging.Frame {
 			Length:   f.DataLen(),
 			Fin:      f.Fin,
 		}
+	case *wire.DatagramFrame:
+		return &logging.DatagramFrame{
+			Length: logging.ByteCount(len(f.Data)),
+		}
 	default:
 		return logging.Frame(frame)
 	}
diff --git a/internal/logutils/frame_test.go b/internal/logutils/frame_test.go
index dd6b14e4..eb7a0f8e 100644
--- a/internal/logutils/frame_test.go
+++ b/internal/logutils/frame_test.go
@@ -34,6 +34,13 @@ var _ = Describe("CRYPTO frame", func() {
 		Expect(sf.Fin).To(BeTrue())
 	})
 
+	It("converts DATAGRAM frames", func() {
+		f := ConvertFrame(&wire.DatagramFrame{Data: []byte("foobar")})
+		Expect(f).To(BeAssignableToTypeOf(&logging.DatagramFrame{}))
+		df := f.(*logging.DatagramFrame)
+		Expect(df.Length).To(Equal(logging.ByteCount(6)))
+	})
+
 	It("converts other frames", func() {
 		f := ConvertFrame(&wire.MaxDataFrame{MaximumData: 1234})
 		Expect(f).To(BeAssignableToTypeOf(&logging.MaxDataFrame{}))
diff --git a/logging/frame.go b/logging/frame.go
index dfb875f0..75705092 100644
--- a/logging/frame.go
+++ b/logging/frame.go
@@ -59,3 +59,8 @@ type StreamFrame struct {
 	Length   ByteCount
 	Fin      bool
 }
+
+// A DatagramFrame is a DATAGRAM frame.
+type DatagramFrame struct {
+	Length ByteCount
+}
diff --git a/qlog/frame.go b/qlog/frame.go
index 4cfb6c89..498d3982 100644
--- a/qlog/frame.go
+++ b/qlog/frame.go
@@ -57,6 +57,8 @@ func (f frame) MarshalJSONObject(enc *gojay.Encoder) {
 		marshalConnectionCloseFrame(enc, frame)
 	case *logging.HandshakeDoneFrame:
 		marshalHandshakeDoneFrame(enc, frame)
+	case *logging.DatagramFrame:
+		marshalDatagramFrame(enc, frame)
 	default:
 		panic("unknown frame type")
 	}
@@ -218,3 +220,8 @@ func marshalConnectionCloseFrame(enc *gojay.Encoder, f *logging.ConnectionCloseF
 func marshalHandshakeDoneFrame(enc *gojay.Encoder, _ *logging.HandshakeDoneFrame) {
 	enc.StringKey("frame_type", "handshake_done")
 }
+
+func marshalDatagramFrame(enc *gojay.Encoder, f *logging.DatagramFrame) {
+	enc.StringKey("frame_type", "datagram")
+	enc.Int64Key("length", int64(f.Length))
+}
diff --git a/qlog/frame_test.go b/qlog/frame_test.go
index b773e137..bab01f01 100644
--- a/qlog/frame_test.go
+++ b/qlog/frame_test.go
@@ -364,4 +364,14 @@ var _ = Describe("Frames", func() {
 			},
 		)
 	})
+
+	It("marshals DATAGRAM frames", func() {
+		check(
+			&logging.DatagramFrame{Length: 1337},
+			map[string]interface{}{
+				"frame_type": "datagram",
+				"length":     1337,
+			},
+		)
+	})
 })