Benjamin Weider, OC CQ CD (1 February 1923 – 17 October 2008) was a Canadian soldier, author, historian (Napoleonic history), fitness proponent, benefactor of the arts, and entrepreneur.

The Weiders also founded many successful businesses including gyms, nutritional supplements and magazines such as Muscle & Fitness.

[5] The brothers are attributed with creating bodybuilding as a sport, where the focus was on the form and fitness of the body shaped by the exercise.

[2] He co-founded the International Federation of BodyBuilding & Fitness (IFBB) along with brother Joe Weider, and was its president until he announced his retirement on 29 October 2006.

He also co-founded (1936) and ran a physical fitness and sporting goods business from Montreal with his brother, which bears their family name.

[7] Weider was known as an advocate of the theory that Napoleon was assassinated with arsenic poisoning by a member of his entourage during his exile in Saint Helena.

These acquisitions caused controversies over a change in editorial direction, including the resignation of the Civil War Times's editor (Chris Lewis), and general criticisms of anti-Palestine bias.