The newcomers are Ballyvange Ladies, Banbridge Rangers and Newry City Ladies FC, who all enter Division 4.
Cliftonville and YMCA were relegated from the Premier to the Championship, with Fermanagh Mallards and Loughgall Lakers moving in the opposite direction.
Larne go down to Division 1 and Carrick drop out altogether, Limavady and Downpatrick make the step up to the Championship.
There was no relegation from Division 1 or 2, with Derry City going up to the first.
Valley Rangers and Portadown are promoted to Division 2, Sion Swifts and Lisburn progress from the fourth to the third.
Ballymena United Allstars
Glentoran Belfast United
Mid Ulster Ladies
Armagh City Ladies
Derry City Ladies
Portadown Integrated Ladies
Killyleagh YC Ladies
Craigavon City Ladies
Newry City Ladies FC
Ballymena United Allstars (reserves)
Crusaders Strikers (reserves)
Glentoran Belfast United (reserves)
Linfield LAdies (reserves)