Umohoite is a rare oxide and hydroxide mineral. The name of this mineral reflects its composition: uranyl (U), molybdate (Mo) and water (). Its chemical formula is (UO<sub>2</sub>)MoO<sub>4</sub>÷2H<sub>2</sub>O.
Umohoite's type location is in Marysvale, the mineral was first described by Paul F. Kerr and G. P. Brophy in 1953.