Rear Admiral William Jonathan Warrender CBE (born 28 November 1968) is a former Royal Navy officer who served as Flag Officer Sea Training.

[2] He went on to become Assistant Head of UK Military Operations at the Ministry of Defence in January 2013, Commander, United Kingdom Maritime Component, Persian Gulf in March 2015.

[4] On 11 May 2018, he was appointed Commander of the Order of the British Empire (CBE) "in recognition of gallant and distinguished services in the field during the period 1 April 2017 to 30 September 2017".

[5] On 19 February 2020 it was announced that he had been appointed CEO of South Western Ambulance Service NHS Foundation Trust with effect from June 2020.

[6] In September 2023 it was announced that he had resigned his position at South Western Ambulance Service.