A rotary vane pump is a type of positive-displacement pump that consists of vanes mounted to a rotor that rotates inside a cavity. In some cases these vanes can have variable length and/or be tensioned to maintain contact with the walls as the pump rotates.

This type of pump was invented by Charles C. Barnes of Sackville, New Brunswick, who patented it on June 16, 1874. There have been various improvements since, including a variable vane pump for gases (1909).

This type of pump is considered less suitable than other vacuum pumps for high-viscosity and high-pressure fluids, and is complex to operate. They can endure short periods of dry operation, and are considered good for low-viscosity fluids.