TheFork users who ate in Positano have said really good things about Ristorante Pupetto, Mele Pizza & Grill and Agriturismo Nonno Luigino. Maybe you should give them a try!
Some of the more popular Pizzeria restaurants that offer vegetarian options on their menu in Positano according to TheFork users include:
Ristorante Pupetto, with a 9.8 rating
Mele Pizza & Grill, with a 8.8 rating
Agriturismo Nonno Luigino, with a 9.2 rating