Jamesoniella is a genus of liverworts in the family Adelanthaceae. The genus was circumscribed by Richard Spruce and in London Cat.Brit. Moss. Hepat. ed.2 on page 25 in 1881 and then in Krypt.-Fl. (Rabenhorst) ed. 3, 6: 858 in 1957. The genus name of Jamesoniella is in honour of William Jameson (1796–1873) was a Scottish-Ecuadorian botanist.