Mike Leigh (born 20 February 1943) is an English screenwriter, producer, director and former actor with a film, theatre, and television career spanning more than 60 years. His accolades include prizes at the Cannes Film Festival, the Berlin International Film Festival, and the Venice International Film Festival, three BAFTA Awards, and nominations for seven Academy Awards. He also received the BAFTA Fellowship in 2014, and was appointed an Officer of the Order of the British Empire (OBE) in the 1993 Birthday Honours for services to the film industry.

Leigh studied at the Royal Academy of Dramatic Art (RADA), the Camberwell School of Art, the Central School of Art and Design and the London School of Film Technique. His short-lived acting career included the role of a mute in the 1963 Maigret episode "The Flemish Shop". He began working as a theatre director and playwright in the mid-1960s, before transitioning to making televised plays and films for BBC Television in the 1970s and '80s. Leigh is known for his lengthy rehearsal and improvisation techniques with actors to build characters and narrative for his films. His purpose is to capture reality and present "emotional, subjective, intuitive, instinctive, vulnerable films".

Leigh's early films include Bleak Moments (1971), Meantime (1983), Life Is Sweet (1990), and Naked (1993). He received Academy Award nominations for Best Director and Best Original Screenplay for Secrets & Lies (1996) and Vera Drake (2004). He received further Academy Award nominations for Topsy-Turvy (1999), Happy-Go-Lucky (2008), and Another Year (2010). Other notable films include All or Nothing (2002), Mr. Turner (2014), Peterloo (2018), and Hard Truths (2024). His stage plays include Smelling A Rat, It's a Great Big Shame, Greek Tragedy, Goose-Pimples, Ecstasy and Abigail's Party.

Leigh was born on 20 February 1943 to Phyllis Pauline (née Cousin) and Alfred Abraham Leigh, a doctor. Leigh was born at Brocket Hall in Welwyn Garden City, Hertfordshire, at the time a maternity home. His mother, in her confinement, went to stay with her parents in Hertfordshire for comfort and support while her husband was serving as a captain in the Royal Army Medical Corps. Leigh was brought up in the Broughton area of Salford, Lancashire. He attended North Grecian Street Junior School. He is from a Jewish family; his paternal grandparents were Russian-Jewish immigrants who settled in Manchester. The family name, originally Lieberman, was anglicised in 1939 "for obvious reasons". When the war ended, Leigh's father began his career as a general practitioner in Higher Broughton, "the epicentre of Leigh's youngest years and the area memorialised in Hard Labour." Leigh went to Salford Grammar School, as did the director Les Blair, his friend, who produced Leigh's first feature film, Bleak Moments (1971). There was a strong tradition of drama in the all-boys school, and an English master, Mr Nutter, supplied the library with newly published plays.

Outside school, Leigh thrived in the Manchester branch of Labour Zionist youth movement Habonim. In the late 1950s, he attended summer camps and winter activities over the Christmas break all round the country. During this time the most important part of his artistic consumption was cinema, although this was supplemented by his discovery of Picasso, Surrealism, The Goon Show, and even family visits to the Hallé Orchestra and the D'Oyly Carte. His father strongly opposed the idea that Leigh might become an artist or an actor. He forbade him his frequent habit of sketching visitors who came to the house and regarded him as a problem child because of his creative interests. In 1960, "to his utter astonishment", Leigh won a scholarship to RADA. Initially trained as an actor at RADA, Leigh started to hone his directing skills at East 15 Acting School, where he met the actress Alison Steadman.

Leigh responded negatively to RADA's agenda, finding himself being taught how to "laugh, cry and snog" for weekly rep purposes, and became a sullen student. He later attended Camberwell School of Arts and Crafts (in 1963), the Central School of Art and Design and the London School of Film Technique on Charlotte Street. When he had arrived in London, one of the first films he had seen was Shadows (1959), an improvised film by John Cassavetes, in which a cast of unknowns was observed "living, loving and bickering" on the streets of New York, and Leigh "felt it might be possible to create complete plays from scratch with a group of actors". Other influences from this time included Harold Pinter's The Caretaker—"Leigh was mesmerised by the play and the (Arts Theatre) production"—Samuel Beckett, whose novels he read avidly, and Flann O'Brien, whose "tragi-comedy" Leigh found particularly appealing. Influential and important productions he saw in this period included Beckett's Endgame, Peter Brook's King Lear and in 1965 Peter Weiss's Marat/Sade, a production developed through improvisation, the actors basing their characterisations on people they had visited in a mental hospital. The visual worlds of Picasso, Ronald Searle, George Grosz, and William Hogarth exerted another kind of influence. Leigh had small roles in several British films in the early 1960s (West 11, Two Left Feet), and played a young deaf-mute, interrogated by Rupert Davies, in the BBC Television series Maigret. In 1964–65, he collaborated with David Halliwell, and designed and directed the first production of Little Malcolm and His Struggle Against the Eunuchs at the Unity Theatre.

Leigh has been called "a gifted cartoonist ... a northerner who came south, slightly chippy, fiercely proud (and critical) of his roots and Jewish background; and he is a child of the 1960s and of the explosion of interest in the European cinema and the possibilities of television."

In 1965, Leigh went to work at the Midlands Art Centre in Birmingham as a resident assistant director and started to experiment with the idea that writing and rehearsing could be part of the same process. The Box Play, a family scenario staged in a cagelike box, "absorbed all sorts of contemporary ideas in art such as the space frames of Roland Pichet..it was visually very exciting," and two more "improvised" pieces followed.