Gianyar Regency is a regency (kabupaten) in the Indonesian province and island of Bali, Indonesia. It has an area of 368.0 km2 and had a population of 469,777 at the 2010 Census, and 515,344 at the 2020 Census, making it the second most densely populated district in Bali ; the official estimate as of mid-2022 was 523,973 - comprising 262,708 males and 261,264 females. Its regency seat is the town of Gianyar. The civil registry survey of April 2011 listed 480,447 people, of which 469,929 were classified as Hindu.

Ide Anak Agung Gde Agung, alternatively spelled too as Ida Anak Agung Gde Agung, was an Indonesian ethnic-Balinese politician, historian, and National Hero, who was the Raja of Gianyar, Bali, and served as the prime minister of the State of East Indonesia from 1947 to 1949, and the Foreign Affairs Minister of Indonesia from 1955 until 1956.