Arthur Grosvenor Daniells (September 28, 1858 – April 18, 1935) was a Seventh-day Adventist minister and administrator, most notably the longest-serving president of the General Conference. He began to work for the church in Texas in 1878 with Robert M. Kilgore and also served as secretary to James and Ellen White for one year, and later worked as an evangelist. In 1886, he was called to New Zealand and was one of the pioneers of the Seventh-day Adventist Church in the South Pacific. Daniells had astounding success through his dynamic preaching and on October 15, 1887, he opened the first Seventh-day Adventist church in New Zealand at Ponsonby. While there he served as president of the New Zealand Conference (1889 to 1891), and of the Australia Conference (1892 to 1895). Later, he became the president of the Australasia Union Conference before becoming president of the General Conference in 1901 and served as president until 1922.