Lynbrook is a suburb in Melbourne, Victoria, Australia, 36 km south-east from Melbourne's central business district. Its local government area is the City of Casey. At the 2011 Census, Lynbrook had a population of 6,772.
Lynbrook is positioned on the South Gippsland Highway, slightly north-west of Cranbourne, and just south of the residential suburb of Hampton Park. Lynbrook is bounded by Dandenong Hastings Road in the west, the South Gippsland Freeway in the north, by a line north of Merinda Park railway station in the east, and the railway line in the south.
The suburb was developed by VicUrban, starting in 1994. A special feature of the VicUrban development is the stormwater catchment which flows into the lake and wetlands where it is purified before being released into Dandenong Creek and into Port Phillip Bay.
Prior to 1994, the area now occupied by Lynbrook was part of Lyndhurst.