John Ganzoni, 1st Baron Belstead

Francis John Childs Ganzoni, 1st Baron Belstead, DL FRGS (19 January 1882 – 15 August 1958) was a Conservative Party politician in England.

Born to Julius Charles Ganzoni and Mary Frances Childs, Ganzoni was educated at Tonbridge School and Christ Church, Oxford, from which he received a Master of Arts in 1906. In that same year, he became a barrister with membership of the Inner Temple. On 31 May 1930, he married Gwendolen Gertrude Turner. He was the father of John Ganzoni, 2nd Baron Belstead.

Ganzoni served in the First World War with the 4th Battalion of the Suffolk Regiment of the 4th Battalion; he rose to the rank of Captain. On 23 May 1914, he won a by-election to become the Conservative Member of Parliament (MP) for the formerly Liberal constituency of Ipswich, a position he would hold, with the exception of a brief period from 1923 to 1924, until 1938. During his parliamentary career, he held other positions. He served as Chairman of the Private Bills Committee from 1923 to 1938. In 1924, he became Parliamentary Private Secretary to the Postmaster-General, retaining that position until 1929. He held the office of Deputy Lieutenant (DL) of Suffolk.