Hlauptungufoss is a waterfall in the south of Iceland in the river Brúará. There are several waterfalls in the river Brúará; Hlauptungufoss is a small one with a height of appr. 2 meters. The waterfall is located 1,5 kilometer downstream from the famous Brúarfoss.
Take road 1 up to Mosfellsbær. Turn into road 36 to Þingvellir. From there take road 365 to Laugarvatn and in addition take road 37 in the direction to the Geysir. About 2-3 kilometer after you crossed road 355 you will cross the river Brúará. Here you can also find a small parking. Walking upstream brings you to Hlauptungufoss and Brúarfoss. The trail is a bit muddy at places when it rains but the walk is quite easy.
Between Brúarfoss and Hlauptungufoss there is another small waterfall called Miðfoss.