Colin Mackenzie Simpson[1] (born March 5, 1959) is an American lawyer and Republican politician who served in the Wyoming House of Representatives from District 24 from 1999 to 2011.

[3] After leaving the legislature in early 2011, Simpson resumed his law practice in Cody.

Simpson currently practices law in Cody and is a member of the Board of Trustees of the Buffalo Bill Historical Center there.

Simpson received his undergraduate degree from Colorado College and his Juris Doctor from the University of Wyoming.

[citation needed] Simpson was elected to the Wyoming Legislature in 1998 and served six terms as a Republican representative from Park County.