Byron Brenan CMG, (7 December 1847 – 28 February 1927), was a British diplomat who served in China from 1866. His last position before retirement was as British Consul General in Shanghai from 1899 to 1901. Brenan had English and Irish ancestry. His second brother worked for Chinese Maritime Customs Service. One of his nephews John Fitzgerald Brenan was also a diplomat who also served as same British Consul General in Shanghai from 1930 to 1937.