MD. Alex O’Brien (August 2003 to May 2005)
Arrived from Everton, DIED

ST. Billy O’Neill (December 1998 to July 2000)
Arrived from Youth Team, left for West Ham United

DF. Peter O’Neill   (August 1955 to May 1963)
Arrived from Youth Team, left for Everton

DF. Andy O’Reilly (April 1895 to May 1912)
FOUNDER MEMBER, RETIRED

MD. Stephen Ollie (July 2001 to June 2002)
Arrived from Kilmarnock, left for Dundee United

DF. Deon Osbourne (July 1999 to July 2001)
Arrived from Youth Team, left for Coventry City