You just have to make your choice! There are lots of opportunities to taste traditional dishes and local cuisine in the local taverns all around the island.
In addition to the Greek cuisine, especially in the tourist towns, there are many restaurants offering international cuisine at a very good level where you can eat the best Italian, Chinese, Indian, English etc… dishes.
In this section you’ll come to know the best restaurant of the island, for quality of food, for the position, for the sight and for the service.
https://www.tripadvisor.com/Restaurants-g196481-Ios_Cyclades_South_Aegean.html
Katogi Taverna: One of the best places on the island to try a range of traditional dishes from spicy feta dips and tasty tzatziki to sautéed octopus and yummy meatballs. The staff are friendly and welcoming and the atmosphere is always a buzz.
Sainis restaurant: Another traditional Greek taverna that is known for seafood rice and pasta dishes as well as tasty mezze platters. You’re nearly always offered some delicious rakomelo too which is a lovely added treat!
Drakos Taverna: A traditional, family-run taverna located at the end of Mylopotas beach, Drakos fish tavern opened for the first time in 1963. It offers a wide variety of tasty seafood dishes, which you can enjoy by the sea.
Lord Byron: Another place with a lively atmosphere and delicious cuisine is the Lord Byron Restaurant. Portion sizes are large so you may want to choose a couple of dishes and share between a group but it offers great value with good quality ingredients!
The Mills Restaurant: Named after the famous Ios windmills, The Mills is known for its excellent moussaka as well as its succulent grilled calamari and fresh Greek salads.
Polydoros: In the tavern Polydoros in Ios one can - apart from the exquisite dishes - enjoy a rare and hard-to-find intimacy and hospitality. Enjoy their classic cooked foods of traditional Greek cuisine.
Salt: Beachfront modern Greek kitchen, fresh bespoke dishes, refreshing cocktails and beach service.
Ios Club Sunset Dining: At Ios Club, you will find a thriving, bespoke take on cocktails and aperitivo, based on carefully chosen herbs, like basil, lavender, thyme, spearmint, and bergamot. The menu offers Mediterranean cuisine with a Greek twist; main and side dishes, salads, handmade flatbreads, are all designed to accompany a selection of great wines, while the freshest local ingredients and botanical essences will set you off on the most unforgettable culinary journey.