Olav Jakobsen Høyem (1830–1899) was a Norwegian teacher, telegrapher, supervisor of banknote printing and linguist.
He was born in Byneset outside Trondheim in Søndre Trondhjem county.
As a linguist, he fought for a Nynorsk written normal which was more consistent with Trøndersk than Ivar Aasen's version was.
One notable thing is that he etymologically employed the Old Norse character ð as a silent letter in e.g. með [meː], preposition 'with', from Old Norse með, which was spelled med in Ivar Aasen's normal.
He also preferred to use a endings where Ivar Aasen's normal has i, e.g. sola noun 'the sun' instead of soli.