Sam Fender, Orla Gartland, David Keenan and Damian Dempsey are all among the new announcements to play in the Church.
Aimée, Brìghde Chaimbeul, Sprints and Tebi Rex were also added to the line-up and will play the IMRO Other Room.
The newly added performers will join Sigrid, Villagers, Mango X MathMan and Tolü Makay, Rachael Lavelle, Melts and Stevie Appleby, Fontaines D.C., John Grant, Kay Young, Houseplants and Gemma Dunleavy.
All of the performances at the church and the Other room will stream live to venues throughout Dingle. They will also be available to view free of charge on YouTube and Facebook. Fans can set reminders for all four nights of livestreams now on YouTube.
Other Voices founder Philip King said: "We’re thrilled to welcome live audiences back to Dingle, that uplifting engagement between audience and artists is really at the heart of the live experience. We have some of the most brilliant musicians in the world making the pilgrimage to West Kerry and we have a gathering up of the new voices and artists who have written the emotional soundtrack to the Ireland of 2021.
"The artists and the crews that make them audible and visible are the heart of the matter and it’s a delight to celebrate their creativity and commitment. It’s going to be great.”
As well as musical performances, Other Voices will also feature Banter: a weekend of conversation in Foxy John's. Cogar: an Irish language happening will also return this year.
Other Voices 2021 will take place in venues across Dingle, County Kerry from November 25th to 28th. See full list of artists below.