The Office Set in the Animal Crossing series consists of three items, except in Animal Crossing: New Horizons where it has only two. The Office Wall and Office Flooring complement the set, however they are not considered as part of the set for HHA score calculation purposes.
Doubutsu no Mori, Animal Crossing, and Doubutsu no Mori e+
Animal Crossing: Wild World
Animal Crossing: City Folk
Animal Crossing: New Leaf
Animal Crossing: New Horizons