Carl Gallagher (born 31 December 1991) is the fourth oldest Gallagher sibling. The son of Frank and Monica, his brothers are Phillip and Liam; his sisters are Fiona, Debbie, and Stella; his half-brothers are Ian and Nigel; and his half-sister is Delia. Initially he played only a minor role in the show, but since series two has been featured just as much as the other Gallagher children. He has slept with Meena Karib, along with various others, and has a minor crush on Norma, his mother's former lesbian lover.
In series 3, Carl briefly worked for the Maguires by growing marijuana for them in his loft, until the police found out about the production. Carl was briefly taken into custody, and gave a statement that the marijuana was grown for the household's own personal use. But after a tip was given to the police about Mandy Maguire selling weed, her mother Mimi suspected that Carl betrayed them and sent her sons Donny and Shane after him. Later Carl's siblings, Lip, Ian, and Debbie, figured out that the only person with the motive for informing the police about Mandy's dealings, was in fact her brother Shane, who was angry that his mother chose his sister over him to oversee that area of the family business. After Lip confronted Shane over the matter, Shane agreed to call off the family hunt for Carl.
Carl's current girlfriend is Maxine Donnelly, an auxiliary nurse. As of series 6, Carl is one of the few people on the estate, along with Maxine and his half-brother Ian, who is aware of Mickey Maguire's homosexuality. Mickey has of late made several passes at Carl.