Lachlan may refer to:
People
Lachlan (name), masculine name.
Places
Several places in New South Wales, Australia, named for Lachlan Macquarie. For a more complete list, see Places named after Macquarie Electoral district of Lachlan, an electoral district of the Legislative Assembly in New South Wales, Australia Electoral district of Lachlan and Lower Darling, an electoral district of the Legislative Assembly in New South Wales, Australia Lachlan River, a river in central New South Wales, Australia Lachlan Shire, a local government area in the central west of New South Wales, Australia Lachlan Valley Railway, a rail preservation society based at Cowra, New South Wales, Australia Lachlan Valley Way, a state highway in New South Wales, Australia Upper Lachlan Shire, a local government area in the state of New South Wales, Australia Lachlan, Tasmania, a locality Lachlan Fold Belt Lachlan Island