The Mandarin's House (Chinese: 鄭家大屋; Portuguese: Casa do Mandarim & Casa da Cheang) is a historic residential complex in São Lourenço, Macau.

It was the residence and family home of the late Qing theoretician and reformist Zheng Guanying (1842–1921).

He completed his masterpiece Shengshi Weiyan (Words of Warning in Times of Prosperity) in the house.

It was built largely in Cantonese style but is noted for its fusion of western architectural elements.

In 2005, the house was listed as part of the Historic Centre of Macau, a UNESCO World Heritage Site.