St. Sebastian's Church (Spanish: Iglesia de San Sebastián) is a Catholic church in the historic centre of Lima in the corners of Ica and Chancay streets, one block from Tacna Avenue, in the old neighbourhood of Monserrate (then Cuartel Primero).

The layout of the temple is incorrectly attributed to Francisco Becerra (1545-1605), architect or builder from Extremadura, native of Trujillo, Spain.

Its most valuable element is the main altarpiece, which dates back to the 18th century, which was restored with the support of Spanish cooperation.

On the balcony of the parish the only “crow's foot” that served as the lamp used as an element of public lighting is preserved.

The parish house of San Sebastián is a small and modest building, but it forms a unit with the church and plays an important urban function as a closing element of the square.