Otto Lagerfeld (20 September 1881 – 4 July 1967), was a German businessman, who in 1919 founded the German company Lagerfeld & Co, which imported evaporated milk.

He was the son of a wine merchant from Hamburg, Tönnies Johann Otto Lagerfeld (1845–22 June 1931) and his wife Maria Lagerfeld, born Wiegels. 

He was married to Elisabeth Bahlmann (1897–1978), daughter of the Catholic Centre Party local politician Karl Bahlmann, and they were the parents of fashion designer Karl Lagerfeld.

Otto Lagerfeld and his family belonged to the Old Catholic Church.