Sir Ernest Mason Satow (June 30, 1843 – August 29, 1929) was a British scholar, diplomat, translator, and expert on Japan. He was one of the first British diplomats in Japan and developed a reputation for his excellent linguistic skills, allowing him to become a rising star in the British consular service. He spent most of his career in Asia and played an important role in negotiating the Boxer Protocol following the Boxer Uprising. He wrote and translated many works, including A Guide to Diplomatic Practice, which has been republished regularly and is still used in the training of diplomats.