A Third Party Advertiser (TPA) is an individual, corporation or group who promotes or opposes a municipal or school board candidate through election advertising.

In 2021 TPAs were allowed to take part in election advertising from May 1 to October 18. Campaigning and advertising is not allowed in voting stations.

All TPAs who intend to incur expenses or contributions of at least $1,000 must register with their local municipality. If a TPA plans to advertise in more than 10 jurisdictions, then they may register with the Provincial Registrar at Municipal Affairs. They can be reached at 780-427-2225 (dial 310-0000) first for toll-free or by email: ma.lgsmail@gov.ab.ca.