Lois Wilson, also known as Lois W., was the co-founder of Al-Anon Family Groups, a 12-Step fellowship for the friends and family of alcoholics. She was the wife of Alcoholics Anonymous (AA) co-founder Bill W. They both followed their respective groups' tradition of anonymity until The New York Times revealed their full names upon Bill's death in 1971. However, she continued to be known as Lois W. within Al-Anon until her death.

Al-Anon Family Groups, founded in 1951, is an international mutual aid organization for people who have been impacted by another person's alcoholism. In the organization's own words, Al-Anon is a "worldwide fellowship that offers a program of recovery for the families and friends of alcoholics, whether or not the alcoholic recognizes the existence of a drinking problem or seeks help." Alateen "is part of the Al-Anon fellowship designed for the younger relatives and friends of alcoholics through the teen years".