Toxana is a heritage-listed residence and initial premises of the Hawkesbury Agricultural College (1891-1896) at 147 Windsor Street, Richmond, City of Hawkesbury, New South Wales, Australia. It was added to the New South Wales State Heritage Register on 2 April 1999.

Hawkesbury Agricultural College was the first agricultural college in New South Wales, Australia, based in Richmond. It operated from 1891 to 1989.