Nicholas Adderley (born 1966) is an English former senior police officer who served as Chief Constable of Northamptonshire Police from 2018 to 2024. He was dismissed for gross misconduct, having embellished his military service in the Royal Navy and fabricated receiving both the General Service Medal (1962) and South Atlantic Medal.

Adderley was born in 1966, and grew up in New Moston, Manchester, England. As a child, he was a member of the Sea Cadets, a youth organisation that is sponsored by the Ministry of Defence, from the age of ten. Adderley joined the Royal Navy in 1984 as a rating and left after serving for less than two years with the rank of able seaman.

He would later make the false claims that he had attended the Britannia Royal Naval College and served for 10 years in the Navy as an officer reaching the rank of lieutenant or commander.

Adderley joined Cheshire Constabulary in 1992 at the age of 25 as a police constable.

He then took a break from the Police Service but has claimed to have worked in the public sector at the Home Office for 2 years at the Police Standards Unit, on secondment as a Chief Inspector. However, according to the response to a Freedom of Information Act request, Adderley worked for the Home Office from February to October 2006. Adderley was also reported serving as a Chief Inspector within Cheshire in August 2006.

He later transferred to the Greater Manchester Police (GMP), where he was promoted to Chief Superintendent in August 2011. In September 2013, he became the territorial commander of the North Manchester Division; keeping the same rank.

In 2015, he was promoted to assistant chief constable at Staffordshire Police after completing his Strategic Command Course.

On 6 August 2018, Adderley became Chief Constable of Northamptonshire Police.