Melissodes rivalis, the rival long-horned bee, is a species of long-horned bee in the family Apidae. It is most commonly found in northern parts of the United States, as well as Canada. This species is native to Montana, although it has also been spotted in other northern states including Idaho, Wyoming, and Minnesota. As a part of the Eucerini tribe, this species' male has unusually long antennae, as well as being a solitary bee, therefore, it does not create colonies or store honey, though some may form large aggregations. Unlike colonial bees, the female Melissodes rivalis constructs and provisions her own fossorial nest without outside help, while males tend to sleep in flower heads.

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