The acts will be joined one the mainstage by a number of other well-established, and rising stars, including Manic Street Preachers, Caribou, Laura Marling and Lianne La Havas.
The Vaccines, Sbtrkt, and Jon Hopkins lead the acts on the BBC 6Music stage, where Years & Years, and the 2014 Mercury Prize winners Young Fathers will also perform.
La Roux will also perform, following the success of her latest album ‘Trouble In Paradise’, and King Creosote, with Jon Hopkins also on the bill.
Noel has shared his excitement ahead of the event, stating: "Well not only have I never played at Latitude before, but I’ve never even been there, ever. So yes, I’m really looking forward to headlining the Festival on July 19th."
The Suffolk event takes place from the 16 - 19 July, and fans can buy tickets online here.
Alt-J have played at the festival a number of times
It’s not just about the music at Latitude, and the previously-announced comedy tent line-up includes a whole host of big names.
Festival-goers will be treated to stand-up from stars including Shappi Khorsandi, ventriloquist Nina Conti and American export Rob Delaney.
See all the latest information on Latitude Festival here.