Oisix Niigata Albirex Baseball Club (オイシックス新潟アルビレックス・ベースボール・クラブ, Oishikkusu Niigata Arubirekkusu Bēsubōru Kura) is a professional baseball team based in Niigata Prefecture, Japan. Founded in 2006, it competes in the Eastern League, one of the two minor leagues ("ni-gun") of Japanese professional baseball.
The club was member of the Baseball Challenge League from its debut season in 2007 until 2023. In 2024, it joined the Eastern League as the only team in the competition not affiliated with any Nippon Professional Baseball (NPB) franchise.