The Sir Robert Ho Tung Library (Portuguese: Biblioteca Sir Robert Ho Tung; Chinese: 何東圖書館) is a public library in São Lourenço, Macau, China. A part of the Macao Public Library system, is located in in the Historic Centre of Macau, a UNESCO world heritage site. The library is housed in a mansion that has good historical, cultural and architectural value. The old building has the head office of the library system, located on the ground floor, and the offices of the Macao ISBN Agency, located on the second floor.