Faithless first came to prominence in 1994 and the group's singles have included Salva Mea, Insomnia and God is a DJ.
Taking place in a field at Dores near Inverness on 19 August, Groove Loch Ness was first held in 2015.
This year's other acts include Skream, Julio Bashmore, Theo Kottis, Kidnap Kid and sets by local DJs.
Dance music act Faithless is to perform a DJ set at this summer's Groove Loch Ness.