Old Guildford is a suburb of Sydney, in the state of New South Wales, Australia 28 kilometres west of the Sydney central business district, in the local government area of the City of Fairfield.

Prior to colonization, the Dharug people lived in small groups across the Cumberland Plain, including in the area which is now the Woodville Ward.

Although the name of the property changed to Orchardleigh in 1843 when it was sold by North, the name Guildford stuck to the region and the small hamlet which developed in the area around Woodville Road.

The majority of the suburb's residents (53.3%) were Australian born with the next most common place of birth being Lebanon (12.5%) followed by Afghanistan (2.7%), China (2.7%), Iraq (2.1%) and Vietnam (2.1%).

Top ancestries were Lebanese (33.9%), Australian (12.3%), English (7.2%), Chinese (6.1%) and Syrian (2.9%).