21. 9-15 Pinocchio's Pizza, 74 Winthrop St, just off JFK St. Everybody was happy with their food.
Pinocchio's is the classic Harvard undergrad eatery. It's been around forever - over 30 years - and due to its proximity to the "River Houses" many, many students buy slices there. Locals call it Noch's (pronounced "nokes"). On the walls of the tiny shop are many pictures of Harvard varsity teams, usually signed by all the athletes, plus a chemical breakdown of pizza. The food is good - nice variety of pizzas, many of them available as slices, usually in a deep-dish Sicilian style (but they do offer "regular" pizza that has a thin crust). Their subs are fine also.
If it's busy, make sure to jump into the line that starts at the right of the counter and winds through the seating area. Rookies come in on the left and are ignored!
If you're looking for a typical Harvard eating spot, Pinocchio's is it. Around $5-$6 per person.