Cooma Cottage is a heritage-listed former farm and tuberculosis sanatorium and now house museum and historic site at Yass Valley Way, Marchmont, Yass Valley Shire, New South Wales, Australia. It was built from 1830 to 1837 by Cornelius and Rebecca O'Brien. It is also known as Hamilton Hume's House, Humedale Stud, and New Nordrach Institute for Consumption. The property is owned by the National Trust of Australia (NSW). It was added to the New South Wales State Heritage Register on 1 March 2002.