Bolex International S. A. is a Swiss manufacturer of motion picture cameras based in Yverdon located in Canton of Vaud, the most notable products of which are in the 16 mm and Super 16 mm formats. Originally Bol, the company was founded in 1925 by Charles Haccius and Jacques Bogopolsky (aka Bolsey or Boolsky), the company's name having been derived from Bogopolsky′s name. In 1923 he presented the Cinégraphe Bol at the Geneva fair, a reversible apparatus for taking, printing, and projecting pictures on 35 mm. film. He later designed a camera for Alpa of Ballaigues in the late 1930s.

Paillard-Bolex cameras were much used by adventurers, artists, as well as nature films, documentaries, and are still favoured by many animators. Over the years, notable Bolex users and owners include: Steven Spielberg, Ridley Scott, Andy Warhol, Peter Jackson, Jonas Mekas, Jean-Luc Godard, Antoine de Saint-Exupéry, James Dean, David Lynch, Marilyn Monroe, Edmund Hillary, and Mahatma Gandhi

While some later models are electrically powered, the majority of those manufactured since the 1930s use a spring-wound clockwork power system. The 16 mm spring-wound Bolex is a popular introductory camera in film schools.