Museums of History NSW is a statutory body of the government of New South Wales that is responsible for historic sites, state collections and archives in New South Wales, Australia.

In 2023, the former State Archives and Records Authority was merged with Sydney Living Museums (formerly known as Historic Houses Trust of New South Wales) to form MHNSW.

The sites include various houses, gardens, parklands and urban spaces.

Since then, the Trust had expanded to care for 12 houses, gardens and museums in New South Wales.

In 2013, the Historic Houses Trust launched its new identity as Sydney Living Museums to refresh and unify its diverse range of properties and highlight its role and relevance for current and future generations.