Torre Sant'Agnese, Medieval tower in Pisa, Italy.

Torre Sant'Agnese is a medieval tower in Pisa built with a square design, combining stone blocks at the corners with brick throughout the remaining walls. The structure stands as part of the city's ancient defensive fortification system that once surrounded and protected the urban center.

Built at the end of the 13th century for Federico I da Montefeltro, the tower was raised largely with materials taken from the towers of Pisa's Guelphs after the unrest that followed the Battle of Meloria in 1284. It guarded the Porta dei Lecci, the gate into the Terzanaia. In the 15th century, under the first Florentine rule, it was entirely rebuilt.

The tower takes its name from the former Church of Sant'Agnese and forms part of the historical defensive walls system of Pisa.

The tower stands along Via Nicola Pisano, near the ancient walls of Pisa. It is currently undergoing restoration along with the adjacent section of wall facing the Terzanaia area, so access may be limited. The exterior can be viewed from the street.

The tower's military role left only small openings of different shapes and sizes, some framed in stone, others topped by rectangular or pentagonal lintels. On the south side, a small portal still in place may have led to a suspended wooden walkway. The tower is being restored together with the stretch of wall facing the former Terzanaia.