Toxana, Heritage residence in Richmond, New South Wales, Australia

Toxana is a two-storey brick residence at 147 Windsor Street, Richmond, built probably in 1843–4 for William Bowman. It has sandstone quoins, a curved entrance stair with iron railings, and an upper verandah with decorative lacework ironwork. The house stands between Market and Toxana Streets on land shown with a garden and sheds in H. F. White's 1836 survey.

John Bowman received 100 acres at Richmond in 1799 and began a house on Windsor Street in 1821. His son William was granted the Toxana site between Market and Toxana Streets in the 1830s; research cited in the heritage listing dates the present building to about 1843–4, with brickwork by James Melville and joinery by George Marlin. From 1891 to 1896 it housed the Hawkesbury Agricultural College.

The residence blends Georgian and Regency design traditions from the mid-1800s colonial period in New South Wales. The ironwork railings and decorative posts on the upper verandah show the craftsmanship valued during that era.

The house is located at 147 Windsor Street and remains in private ownership, though it can be viewed from the street. Its inclusion on the New South Wales State Heritage Register means it is legally protected.

Toxana's builder is disputed: some credit carpenter George Marlin and his three sons, others bricklayer James Melville, who recalled doing the brickwork and kept receipts for sand and materials. The house went up around 1842-4, at the height of the 1840s boom, before depression hit the colony's pastoral elite.