He joins Lulu, Squeeze, Tom Odell and a string of other acts in the Dumfries and Galloway event.
Cliff is best known for chart-topping hits like Wonderful World,  Beautiful People and You Can Get It If You Really Want.
The festival takes place at Dundrennan on 24 and 25 July.
The Wickerman Festival's Brian Reynolds said: "This year's Wickerman Festival is shaping up to be an epic weekend and we know that fans will be blown away by the fantastic live performances that our latest batch of artists will deliver.
"Jimmy Cliff, The Sonics and The Sugarhill Gang are legendary, genre-defining artists who will ensure that this year's festival will be a brilliant celebration of music."
Reggae legend Jimmy Cliff has been added to this year's Wickerman Festival, along with the likes of Neneh Cherry, Stereo MCs and Julian Cope.