Sebastiano Guala was an Italian church architect active between 1640 and 1680 in the area of Casale Monferrato, then capital of the Gonzaga-ruled state of Montferrat.
He was born into a prominent family of Frassinello Monferrato and became a canon of the Collegiata di Santa Maria di Piazza in Casale.
[1] It has been thought probable[2] that he belonged to the same family as the Casalese painter Pier Francesco Guala (1698–1757).
Churches attributed to Guala include: