Philip A. Marquam (February 28, 1823 – May 8, 1912) was a lawyer, judge, legislator, and real estate developer in the U.S. state of Oregon.

The hill is now the site of the Oregon Health & Science University and the Portland Veterans Affairs Medical Center.

He built the Marquam Grand Opera House in Portland, later renamed the Orpheum Theater.

The youngest child, Thomas Alfred "Tom" Marquam, served as mayor of Fairbanks, Alaska from 1923 to 1925.

[3] Marquam died at the home of one of his daughters, in southwest Portland, shortly after midnight on May 8, 1912, four days after suffering a stroke.