Dirty Filthy Love is a British single television drama starring Michael Sheen as an architect living with obsessive–compulsive disorder (OCD) and Tourette syndrome.

In addition to Michael Sheen, the cast features Shirley Henderson, Anastasia Griffith, Adrian Bower and Claudie Blakley.

Mark Furness (Sheen), once a successful architect, finds it increasingly difficult to control his "bad habits", such as climbing stairs in a strange sequence, swearing involuntarily and washing himself compulsively.

His wife, Stevie (Griffith) asks him to leave their home, so he seeks solace with his best friends Nathan (Bower) and Kathy (Blakley), who take him under their wing.

In the doctor's waiting room, another patient, Charlotte (Henderson), recognizes Mark's "habits" as symptoms of obsessive-compulsive disorder and Tourette syndrome, and invites him to a local self-help group she runs.

Mark finds it comforting that others share his disorder and with Charlotte's help, hopes to face his problems and win his wife back.

His situation gets worse still when (now with unkempt hair, matted beard and shabby clothes) he begins to stalk Stevie, convinced she has begun a relationship with another man.