Kellie Armstrong (née McGrattan; 8 September 1970) is an Alliance Party politician from Northern Ireland.

Armstrong was co-opted onto Ards Borough Council to replace retiring member Kieran McCarthy.

Armstrong is the Deputy Chair of the Northern Ireland Assembly's Committee for Communities and holds to account the department's actions with respect to housing, benefits, social strategies, Arts, Heritage and Sport.

She brought forward a motion calling on the NI Assembly to end use of designations and mandatory coalition.

Armstrong provided business development and governance advice for over 150 community organisations to enable better delivery of accessible transport services.