| Character | Played By | Apeared | |
| Lord Alex Oakwell | Rupam Maxwell | (1997-1998) | |
| Dr O'Brien | Damian Christian | ||
| Poor Ocker | Andrew Jarvis | ||
| Niamh O’Connor | Tracey Moore | 11th June 2004, 15th June 2004, 16th June 2004, 18th June 2004, 21st June 2004, 23rd August 2004, 24th August 2004, 25th August 2004, | |
| Sven Olsen | Daniel O'Grady | ||
|
O’Neill
|
Julian Finnigan | Featured November 2002 | |
| Mr. Openshaw | John Woodnutt | ||
| Beth Openshaw | Maureen Morris | ||
| Mel Openshaw | Richard Borthwick | ||
| Ray Oswell | Stewart Bevan | ||
| Sarah Oswell | Virginia Moore | ||
| Jed Outhwaite | Father of Heather Hutchinson and grandfather of Kirsty & Lyn Hutchinson | Tony Melody | (36 episodes 1998) |
