Sean Russell is the name of:

• Seán Russell (1893–1940), Irish republican
• Sean Russell (author) (born 1952), Canadian author of fantasy literature

Seán Russell (1893 – 14 August 1940) was an Irish republican who held senior positions in the IRA until the end of the Irish War of Independence. From 1922 until his death on board a Kriegsmarine U-Boat in 1940 he remained a senior member and chief of staff of the IRA, while it divided and was outlawed, and removed itself to the political fringe of Irish society.