Thomas Barlow Walker (February 1, 1840 – July 28, 1928) was a highly successful American businessperson who acquired timber in Minnesota and California and became an art collector. Walker founded the Minneapolis Public Library. He was among the ten wealthiest men in the world in 1923. He built two company towns, one of which his son sold to become part of what is today known as Sunkist. He is the founder and namesake of the Walker Art Center.