Henry Oliver Walker (1843–1929) was an American painter and muralist. He painted figures and portraits, but is best known for his mural decorations. His works include a series of paintings honoring various poets for the Library of Congress in Washington, D.C.; and decorations for the Appellate Court House in New York; Bowdoin College in Maine; the Massachusetts State House in Boston; the Court House in Newark, New Jersey; and the Minnesota State Capitol in Saint Paul.