Desmond McNamara started his career as a printer, but gave it up to join the Royal Academy of Dramatic Art. He trained for two years and, on leaving, joined the Birmingham Repertory Company where productions included SAVED; VOLPONE; THE GOVERNMENT INSPECTOR; HAMLET; WAITING FOR GODOT; ITALIAN STRAW HAT and HENRY IV part 1. He was a founder member of the Young Vic Company.
| 1997 | DEADWOOD | Uncle Willy | Stephen Rayne | Watermill, Newbury | |
| 1996 | CAMELOT | Merlin/Pellinore | Frank Dunlop | Covent Garden Festival | |
| 1993 | MACBETH | Porter | Stephen Rayne | Committed Artists US Tour & Bridge Lane | |
| 1991/2 | THE BLUE ANGEL | Janitor/Judge | Trevor Nunn | RSC Tour, Young Vic & Globe | |
| 1991/2 | MEASURE FOR MEASURE | Elbow | Trevor Nunn | RSC Tour, Young Vic & Globe | |
| 1991 | TIMON OF ATHENS | Trevor Nunn | Young Vic | ||
| 1990 | TREASURE ISLAND | Israel Hands | Frank Dunlop | Edinburgh Festival | |
| 1986/9 | THE LATE CHRISTOPHER BEAN | Talent | Bill Pryde | Cambridge Theatre Company | |
| JOHN BULL’S OTHER ISLAND | Hodson | ||||
| 1983 | TWELFTH NIGHT | Sir Toby Belch | Denise Coffey | Young Vic | |
| 1981 | A WINTER’S TALE | Antigonus | Hugh Hunt | Young Vic | |
| KING LEAR | The Fool | Frank Dunlop | |||
| 1974/5 | THE ROCKY HORROR SHOW | Riff Raff | Japan | ||
| 1974 | FRONT PAGE | National Theatre Tour of Australia | |||
| 1973 | SATURDAY, SUNDAY, MONDAY | Franco Zefferelli | National Theatre/Queens Theatre | ||
| 1972 | THE GOOD NATURED MAN | Mr. Honeywood | National Theatre (Old Vic) | ||
| THE SOLDIER’S TALE | Devil | Wendy Toye | Young Vic | ||
| THE TAMING OF THE SHREW | Christopher Sly | Frank Dunlop | Young Vic | ||
| MEASURE FOR MEASURE | Claudio | Roland JoffÈ | Young Vic | ||
| LITTLE MALCOLM AND HIS STRUGGLE AGAINST THE EUNUCHS | Malcolm | Peter James | Young Vic | ||
| ENDGAME | Clov | Peter James | Young Vic | ||
| WAITING FOR GODOT | Vladimir/Lucky | Young Vic | |||
| 1970 | ROSS | Ross | Derek Bennett | Richmond Theatre Company |
| 2005 | DOCTORS | Reg Johnson | Arun Bharali | BBC | |
| 2005 | THE BILL | James ëButch’ Cassidy | Rob Knights | Thames Talkback | |
| 2004 | EASTENDERS | Bob | John Greenling | BBC | |
| 2003 | DOCTORS & NURSES | Harry the Scroat | Caroline Jeffreys | BBC | |
| 2002 | THE BILL | Albert Styles | Chris King | Thames TV | |
| 2001 | THE LAST DETECTIVE | Block | Andrew Greive | United/Meridian | |
| 2001 | THE BILL | Dave Ronson | J.J. Keith | Pearson TV | |
| 2000 | LONG HAUL | The Fixer | Bob Blagdon | Maverick TV | |
| 2000 | THE BILL | Arthur Selway | Jo Shoop | Pearson TV | |
| 2000 | CASUALTY | Bert | Tim Leandro | BBC | |
| 1999 | THE S CLUB | Cleaner | Andy Margetson | Initial Films & TV | |
| 1999 | MAISIE RAINE | Tom | Bob Mahoney | Fairgame Films Ltd | |
| 1998 | CASUALTY | Tom Logan | Johnathan Young | BBC | |
| 1997 | ANIMAL ARK | Ernie Bell | John Gorrie | Zenith North | |
| 1996 | SHARMAN | Security Guard | Bob Bierman | World Productions | |
| 1995 | WYCLIFFE | Marrick | Michael Norris | HTV | |
| 1994 | MINDER | Gossip Garvey | Lawrence Gordon Clark | Euston Films | |
| 1993 | PIE IN THE SKY | Lowe | Lawrence Gordon Clark | Select TV | |
| 1991 | BIRDS OF A FEATHER | Alomo Prods/BBC | |||
| 1990 | FIVE CHILDREN AND IT | Mr. Peamarsh | Marilyn Fox | ||
| 1989/90 | THE CHIEF | Terry | Brian Farnham | Anglia | |
| 1988/9 | THE BILL | Alfie Dobbs | Michael Morris/Keith Washington/Brian Farnham | Thames | |
| 1988/9 | STREETS APART | Cliff | Sue Bysh | BBC (2 series) | |
| 1987 | VANITY FAIR | Captain Murdoe | Michael Morris | BBC | |
| 1987 | GAUDY NIGHT | Paggett | Michael Simpson | BBC | |
| 1986 | FORTUNES OF WAR | Galpin | James Cellan Jones | BBC | |
| 1985 | SLIP UP | Lovelace | James Cellan Jones | BBC | |
| 1985 | RUNNING SCARED | Mick Prentice | Marilyn Fox | BBC | |
| 1985 | C.A.T.S. EYES | Binks | James Hill | TVS | |
| 1984/5 | ROLL OVER BEETHOVEN | Lem | Derrick Goodwin | Central TV (2 series) | |
| 1984/5 | DEMPSEY & MAKEPEACE | Charlie Wilson | LWT | ||
| 1984 | THE TRAVELLING MAN | Nolan | Sebastian Graham Jones | Granada | |
| 1984 | THE BLUE CARBUNCLE | Granada | |||
| 1980 | THE SIN BIN | John Gorrie | BBC | ||
| 1979 | ST JOAN | English Soldier | Jane Howell | BBC | |
| 1979 | VISITORS FOR ANDERSON | Brian Farnham | ATV | ||
| 1977 | HAZELL | Tel | Various | Thames TV (series 1 & 2) | |
| 2000 | LUCKY BREAK | Arthur | Peter Cataneo | Fragile Films | |
| 1998 | SHAKESPEARE IN LOVE | Town Cryer | John Madden | Shakepen Productions | |
| 1993 | STAGGERED | Martin Clunes | Big Deal Pictures | ||
| 1993 | PINS FOR THE BUTTERFLY | Deranged man | Ann Skinner | Skreba Films |
| 2007 | THE THIRD TRIAL | Sweetmeat (Steven) | Marc Beeby | BBC R3 | |
| 2007 | THE MOTHER OF.. | Jack | Marc Beeby | BBC R4 | |
| 2006 | EDWARD ALLEYN’S DEVIL | Fardinandoo Black | Steven Canny | BBC R4 | |
| 2006 | EIGHT FRAMES A SECOND | Vass | Steven Canny | BBC R4 | |
| 2006 | THE BROTHERS KARAMAZOV | Grigory + Others | Marc Beeby | BBC R4 | |
| 2006 | THE FALL & RISE OF DANNY CLARK | Gramps | Peter Kavanagh | BBC R4 | |
| 2006 | FROM FACT TO FICTION: RAPID RESPONSE | Dad | Marc Beeby | BBC R4 | |
| 2005 | COMEBACK | Col | Toby Swift | BBC R4 | |
| 1998 | CAMELOT | Merlin/ Pellinore | Dave Batchelor | BBC R2 |