Spencer Baird Nichols (1875–1950) was an American portrait painter, illustrator and muralist. Nichols was born to Henry Hobart and Indiana Jay Nichols on February 13, 1875 in Washington, D.C., and attended the Corcoran School of Art. He died August 28, 1950 in Kent, Connecticut. While he received much recognition and was quite prolific in his time, much of his creative work was ultimately destroyed, lost or unattributed to him. What survives are a handful of easel paintings and some commercial work, particularly book illustrations and murals. More of his earliest works, signed with just the initials, SBN, may gradually come to public recognition with the help of publications such as this.