Blue Door Gallery is a contemporary art gallery located in Boerum Hill, Brooklyn. It was founded in 2021 by artists Tommy May and Gwen O’Neil as an artist-run space in their Hollywood Hills studio. In 2025, the gallery relocated to its current home in a historic brownstone in Boerum Hill.

The gallery focuses on abstract and landscape-based painting, with an emphasis on emerging artists. Programming centers on thoughtfully curated group exhibitions organized by May and O’Neil, reflecting a collaborative and focused curatorial vision.