Elmcroft is a 19th-century house in Smiths Falls, Ontario, Canada, built in 1895 by the town's mayor, Francis Theodore Frost, who also served as director of the local Frost & Wood foundry, as a Member of Parliament and as a senator.

[2] The house, initially built by W. B. Taylor's construction firm,[3] boasts two halls, a dining room, two staircases, a library and stables.

[5] It used to also have a sweeping circular staircase in the front entrance and a rotunda which led to the ballroom, but these were removed by later renovations.

[6] The Roper family of Alton, Illinois, were similarly noted in the media as guests at Elmcroft for a week in 1889.

[4][6] In 1987, owner Bill Murphy stirred controversy by announcing his plans to build 10 garden homes at the foot of the property.