Legal Aid Ontario (LAO) is an agency which provides legal assistance to financially disadvantaged persons in the province of Ontario, Canada. Legal aid is provided primarily for criminal or family matters, for a few specific other types of proceedings, and for duty counsel support in some circumstances. Its mandate includes financial support for 79 community legal clinics in Ontario.

The Toronto-based LAO was formed in 1998 and is primarily funded by the Government of Ontario, although it operates as a separate organisation.