The good lady in my life is Coeliac. We find Ibiza caters for GF really well. Often GF options are available but not on the menu, you just need to ask. GF bread and pasta and beer is readily available most places.
Her favourites below.
There will always be GF options and great knowledge everywhere you go, just ask for sin gluten
Oli Beach (Figueretes) & Oli Port (Ibiza town) - amazing GF menu inc. tapas, beers, burgers, deserts and even have a fried squid sandwich. You have to go to Oli Beach it’s the better of the two even though it’s the same menu
Sa Cova, ibiza town - French restaurant, most of starters & mains GF
Locals Only, ibiza town - lush double cooked chips
Formentera, ibiza town - paella is naturally GF but this is a good one
Passion Cafes - across the island, great for brunch with GF bread
A couple of highlights were Project Social but it’s in Santa Eulalia! Most of the menu GF with good selection of GF beers.
And then Pikes Sunday lunch, they made special gravy and bread! Very accommodating