Lorne M. Trottier, OC (born 15 June 1948) is a Canadian engineer, businessman and philanthropist.

That bug to understand what's going on, from the point of view of what science teaches us about nature, has stayed with me all my life.Trottier has repeatedly made significant donations to his alma mater McGill.

In 2006 his second gift of $12 million created two Lorne Trottier Chairs at the school, one in Aerospace Engineering and the other in Astrophysics and Cosmology.

[7] In November 2011 Trottier gave $5.5 million to make the Symposium permanent and to fund Joseph A. Schwarcz's McGill's Office for Science and Society to educate the public about quackery and to "battle against charlatans."

[16] On 21 November 2022, the Trottier Family Foundation donated Can$26 million to fund space research at McGill University and the Université de Montréal.