The accessories include the PowerUp ChargeDock and the FlipStand Protective Cover.
Also announced is the Tritton Kunai range of headsets, which will be available for the Wii U, PS3, PlayStation Vita and Nintendo 3DS.
Copyright: Mad Catz
"We're excited to be supporting Wii U with a full range of accessories including our new headset. The new range is part of our strategy to bring innovative products to passionate consumers," explained Mad Catz CEO Darren Richardson.
Nintendo unveiled a full list of Wii U games, as well as hardware specifications at this year's E3 Gaming Expo.
The likes of Nintendo Land, Super Mario Bros Wii U and Pikmin 3 were all on display during last week's event in Los Angeles.
Mad Catz, meanwhile, is currently working on aerial combat title Damage Inc. Pacific Squadron WWII, which will launch this summer, alongside an exclusive flight stick.
Watch a trailer for Damage Inc. Pacific Squadron WII below: