Rebecca M. Meluch, published as R. M. Meluch (born October 24, 1956) is an American writer of science fiction.
From 1979 to 1992, Meluch wrote several novels treating a variety of subjects, followed by a period in which she published rarely. In 2005, she published the first of the Tour of the Merrimack series of military science fiction/space opera novels. The series is set on the warship U.S.S. Merrimack in a future where the United States and a recreated Roman Empire are at war with the alien "Hive". In reviews of the series, Jo Walton and Liz Bourke praised the series's colorful and pulpy setting, action-heavy plot and innovative alternate universe plot twists, but criticized it for exhibiting thin characterization, simplistic politics and sexism.