Pfister (June 17, 1859 – November 12, 1927) was a wealthy tannery magnate, bank financier, utility owner, newspaper publisher, hotelier and philanthropist in Milwaukee, Wisconsin.
He was also a central figure in the stalwart "Old Guard" of the Republican Party of Wisconsin during the rise of the state's progressive Republicans.
Although never a political candidate himself, Pfister advised on tactics and used his vast holdings to fund the party's operations, dictate favored legislation, and re-edit the opinion pages of Wisconsin newspapers.
A lifelong bachelor, Pfister belonged to many clubs and organizations but shunned the spotlight.
He donated much of his fortune to local arts groups and charities.