In mathematics, a **Stone algebra**, or **Stone lattice**, is a pseudo-complemented distributive lattices such that *a** ∨*a*** = 1. They were introduced by Grätzer & Schmidt (1957) and named after Marshall Harvey Stone.

Boolean algebras are Stone algebras, and Stone algebras are Ockham algebras.

Examples:

The open-set lattice of an extremally disconnected space is a Stone algebra.
The lattice of positive divisors of a given positive integer is a Stone lattice.