António Joaquim de Medeiros (Chinese: 明德祿; 15 October 1846 – 7 January 1897) was a Portuguese prelate of the Roman Catholic Church. He was born in Portugal, and ordained in 1871. By the mid-1870s he was working in Macau, and in 1877 he traveled to Portuguese Timor to serve in the Catholic missions there. In 1882, he was appointed Auxiliary Bishop of Goa, and in 1884 he was selected Bishop of Macau. He served in that position until his death in 1897.