There are several cheese options that pair well with focaccia, including mozzarella, parmesan, feta, and gorgonzola. The choice of cheese will depend on personal preference and the other ingredients in the focaccia, such as herbs and vegetables. Mozzarella is a classic choice, as it melts well and complements the salty, savory flavors of the bread. Parmesan adds a nutty, cheesy flavor to the bread, while feta adds a tangy, salty element. Gorgonzola, a blue cheese, pairs well with sweet or savory toppings and can add a bold, pungent flavor to the bread.