Philip De Catesby "Phil" Ball (October 22, 1864 – October 22, 1933) was the owner of the St. Louis Terriers of the Federal League from 1914 through 1915 and the St. Louis Browns of the American League from 1916 through 1933.
He was born in Keokuk, Iowa. He died in St. Louis, Missouri of septicemia.  Ball became wealthy refrigeration magnate who owned the Federal Cold Storage Company in St. Louis; he expanded his holdings to include oil wells, ranch lands, and urban commercial real estate. He was considered the Federal League owner most committed to the development of a permanent third major league. .
As the Federal League's bidding war with the established clubs took a financial toll on its owners, Ball remained committed to stocking a competitive roster. His strategy undermined the bottom line of the Terriers, Browns, and St. Louis Cardinals. As part of a final settlement, Robert Hedges sold the Browns to Ball, who was subsequently able to transfer a number of players from his folded club to his new franchise. .
Ball is perhaps best known for demoting pioneering baseball executive Branch Rickey from general manager to business manager in 1915, which lead to his departure for the Cardinals. He considered Rickey's ideas, such as the development of an integrated farm system, to be too radical for the time; however, he also sought to prevent other teams from experimenting with these ideas by unsuccessfully seeking a court order to vacate Rickey's 1917 contract with the Browns' crosstown rivals. 
- Milestones section of Time magazine October 30, 1933.
- Quirk, James P. and Rodney D. Fort, 1997, Pay Dirt: The Business of Professional Team Sports, Princeton University Press, ISBN 0-691-01574-0, p. 47.
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