LMF also known as Lazy Mutha Fucka or Lazy Muthafucka, is a Cantonese hip-hop group in Hong Kong. The group, signed to Warner Music, was founded in 1993, disbanded in 2003 and regrouped in 2009. Some members of LMF are pursuing solo careers.

In contrast with the norm of commercial and packaged Cantopop, LMF write and perform original music. All members of the group hail from poverty and their songs often depict life and struggle in the underclass and working class, and are frequently controversial for their swearing and provocative subject matter. The band are not embraced by mainstream media for reasons that include their perceived negative influence on Hong Kong youth, their promotion of the hip-hop attitude, and their rough appearance that contrasts with the well-dressed and clean-cut performers managed by the music industry.

LMF offers Hong Kong an alternative to Cantopop. LMF is rare or even unique as a well-known local rap group. LMF highlights the economic oppression and social alienation faced by the lower class of Hong Kong, all coming from Hong Kong's overcrowded public housing.

LMF's attempt to establish a foothold in the highly commercial and monopolistic Hong Kong music industry is widely considered to be a success despite achieving only moderate commercial sales, due to their longevity, their name recognition (mostly in negative press coverage), and the original form of music they create. They have a small but die-hard fan base in Hong Kong and Southeast Asia.

Their last and final album, finalazy, was released just before their breakup in 2003.

LMF reformed in December 2009, ten years after their debut release, and went on the "Wild Lazy Tour", including venues in Singapore and Hong Kong.