Arthur Deinstadt Ganong (August 3, 1877 – November 1960) was a Canadian businessman and politician. He was born in St. Stephen, New Brunswick into a chocolate making family and would serve as president of Ganong Bros. Limited from 1917 to 1957. He was known for eating several pounds of chocolate a day. He was the sixth of the seven children of James Harvey Ganong and Susan E. Brittan. His father and his uncle, Gilbert, founded the chocolate-making company in 1873. Among his siblings are educator Susie, businessman Edwin, botanist William, and Kit Ganong Whidden.