Alexey Vermeulen (born December 16, 1994, in Memphis, Tennessee) is an American cyclist currently competing on the professional mountain bike and gravel circuits. Prior to turning professional in 2016, Vermeulen spent the previous three seasons riding for the BMC Development Team. He now competes for Jukebox Cycling, a multi-discipline team of six riders. In 2026, Vermeulen signed a career-long extension with ENVE Composites, extending a partnership that began in 2021.

Vermeulen has become famous on the circuit for training with Sir Willie the Weiner, a long-haired miniature dachshund that he carries in a backpack. Willie belongs to Vermeulen's girlfriend, Sophie Linn.

In 2022 he won the Belgian Waffle Ride California on this third attempt, beating second place Matthew Beers by over 6 minutes. November 4, 2023 Alexey won the Iceman Cometh in Traverse City Michigan.