Okamoto is a Japanese name which means ‘(one who lives) at the base of the hill’. In the works of Harry Turtledove, Okamoto may refer to:

Major Okamoto, a Japanese soldier in the Worldwar series.
Old-man Okamoto, the owner of a diner in Hawaii in Days of Infamy.
Tomatsu Okamoto, a retailer in the Days of Infamy series.