text: John Pitcairn (1841–1916) Scottish-American industrialist who founded PPG Industries; emigrated to Allegheny City at age 5
  William Plankinton (1843–1905), businessman
  Mary Roberts Rinehart (1876–1958), mystery author, born in Allegheny City
  John Buchanan Robinson (1846–1933), politician, born in Allegheny City
  William Robinson, Jr., (1785–1868), politician, businessman and militia general – first mayor of Allegheny City
  Art Rooney (1901–1988), founding owner of the Pittsburgh Steelers franchise of National Football League
  Charles Taze Russell (1852–1916), born in Allegheny City, first president of the Watch Tower Bible and Tract Society, founder of the Bible Students, one branch of which became the Jehovah's Witnesses after his death.
  George E. Smith or "Pittsburgh Phil" (1862–1905), 1870s resident that became a noted gambler and Thoroughbred owner
  John M. Snowden (1776–1845), served as Mayor of Pittsburgh City from 1825 to 1828.
  Leo Stein (1872–1947), born in Allegheny City on May 11, 1872, art collector and critic
  Gertrude Stein (1874–1946), born in Allegheny City on February 2, 1874, American avant-garde writer
  Harry Todd (1863–1935), actor, born in Allegheny City
  Ellwood J. Turner (1886-1948), Pennsylvania State Representative from Delaware County (1925-1948), Speaker Pennsylvania House of Representatives (1939-1941)
  Lois Weber (1879–1939), born in Allegheny City, pioneer silent film actor, screenwriter, producer, and director