Hans Henrik Reusch (5 September 1852 – 27 October 1922) was a Norwegian geologist, geomorphologist and educator.

He was married to the painter Helga Marie Ring Reusch He joined the Geological Survey of Norway in 1875, and was its Director from 1888 to 1921.

He discovered Silurian fossils in the highly altered rocks of the Bergen region; and in 1891 he called attention to the so-called "Reusch's Moraine" a Precambrian conglomerate of glacial origin in the Varanger Fjord, a view confirmed by A. Strahan in 1896, who found glacial striations on the rocks beneath the ancient boulder-bed.

Reusch has likewise thrown light on the later geological periods, on the Pleistocene glacial phenomena and on the sculpturing of the scenery of Norway.

[7] Among his separate publications were Silurfossiler og pressede Konglomerater (1882) and Det nordlige Norges Geologi (1891).