Being such a big city and with a large sea port there's bound to be a good selection of restaurants and pizza places in Gdansk. The city doesn't disappoint. We recommend visiting Oliwa Do Ognia on the Garncarska street. There's excellent reviews online about the place like:
"Nice small pizzeria. Crust was thin, crisp and probably the best I have had. We have tried other pizzerias in Gdansk and this one is the One where we will go again."
Also worth a visit is La Famiglia Pizza on Lektykarska street. Good quality pizza and priced really well too. Authentic Italian experience in Gdansk that's not to be missed. Review like this one speak for itself:
"I'm traveling in Eastern Europe for about 5 weeks and so never expected to only eat Eastern European food. After all, I don't eat American food every day. This pizza was one of the best meals I had in Gdansk. The crust was so light and thin, it was amazing. The waiter said it was going to take 40 minutes to be prepared, but it barely took half that long. If you want a change from Polish food, try this place - you won't be sorry (well - unless you like thick doughy pizza, I guess!)."