Sean Harrington or Seán Harrington may refer to:
*
Seán Harrington (Irish republican) (1900–1976), IRA member from Dublin
*
Seán Harrington (Chief of Staff) (c.1915–1978), Chief of Staff of the IRA
*
Sean J. Harrington (born 1944), Canadian judge
*
Sean Harrington (basketball),
2002–03 Illinois Fighting Illini basketball player
{{hndis, Harrington, Sean