Lain may refer to:
Places Lain, Guinea, a town and sub-prefecture in the Nzérékoré Region Lain, Iran, a village in Kurdistan Province Lain, Yonne, a commune in the Yonne département, France
People Given name Lain (singer), English singer Lain Maw Thee (born 1989), Burmese singer and songwriter Lain Singh Bangdel (1919–2002), Nepalese artist, historian, and novelist Latuinus (died ), also known as Lain, Gallo-Roman bishop and saint
Middle name Pedro Laín Entralgo (1908–2001) Spanish historian, philosopher, physician, and writer
Surname Chasey Lain (born 1971), American actress Chip Lain (born 1958), American stock car racing driver Douglas Lain (born 1970), American novelist Evelina De Lain (born 1977) English pianist Jean-Pierre Le Lain (born 1961), French rower Jean Thomas Dulaien (1727–1728), also known as Jean Thomas du Lain, French pirate Kalmer Lain (born 1968), Estonian politician Kellan Lain (born 1989), Canadian ice hockey player Rosemary Lain-Priestley (born 1967), Anglican priestess T. H. Lain, American pseudonymous novelist Zinedine Hameur-Lain (born 1986), French-Algerian kickboxer
Fictional
Lain Iwakura, the titular character of the anime television series Serial Experiments Lain
Other uses Laining, a synonym for Torah reading Obrascón Huarte Lain, a Spanish construction and civil engineering company