This year's headline acts include The Temperance Movement and Reverend & The Makers.
The event on 25 and 26 September will also feature The Damned, Skipinnish, Skerryvore, Little Mammoths and The Supernaturals.
Ullapool Pipe Band will also be making its traditional appearance at the music festival.
Ullapool's Loopallu music festival has sold out for an 11th year in a row.