The Multnomah Athletic Club is a private social and athletic club in Portland, Oregon, United States. Located in the Goose Hollow neighborhood, it was founded in 1891, and the club has expanded greatly from its beginnings. It now fills two buildings totaling 600,000 square feet (56,000 m2), making it the largest indoor athletic club in the world. It is colloquially referred to as either "The Multnomah Club" or simply "The MAC". Its emblem is a winged "M". It has approximately 22,000 members and employs nearly 600 staff, according to the club's website.