Guildford Grammar School, informally known as Guildford Grammar, Guildford or GGS, is an independent Anglican coeducational primary and secondary day and boarding school, located in Guildford, a suburb of Perth, Western Australia.

Guildford is a suburb of Perth, Western Australia, 12 km northeast of the city centre within the City of Swan. Guildford was founded in 1829 as one of the earliest settlements of the Swan River Colony. It is one of only three towns in the metropolitan area listed on the Register of the National Trust.