Sir Gordon Ivan Hobday (1 February 1916 – 27 May 2015) was a British scientist who worked on penicillin with Alexander Fleming and is noted for his role as director of the Boots research team that developed ibuprofen. He later became chairman of Boots.
Hobday married Margaret Jean Joule on 5 October 1940 and they had one daughter together. In 1995, Margaret died and he remarried on 1 July 2002 to author Patricia Cooper, née Birge. He was Lord Lieutenant of Nottinghamshire 1983–1991. He was made a Knight Bachelor in the 1979 Birthday Honours.
He died on 27 May 2015, in King's Mill Hospital, Sutton in Ashfield at the age of 99.