The Royal Canadian Legion Ladies' Auxiliary is comprised of mothers, wives, daughters, stepdaughters, nieces, sisters, granddaughters, great granddaughters and widows of Legion members. In some Commands, membership is also open to women in the community.

Most, but not all, branches have Auxiliaries which come under the jurisdiction of the Branch. Major contributors to the day to day life of the branch, auxiliaries provide financial and volunteer support to Legion programs.

Any woman who is eligible for membership in the Legion may choose to become a member of the Ladies' Auxiliary only, or a member of both.