Simon Byrne QPM (born 29 April 1963) is a senior British police officer and the Chief Constable of Cheshire Constabulary. He was the Deputy Chief Constable of Greater Manchester Police from 2009 to 2011 and the Assistant Commissioner for Territorial Policing in the Metropolitan Police Service from 2011 to 2014.
Byrne began his career in the police when he joined the Metropolitan Police Service as a constable in 1982. He transferred to Merseyside Police in 1985. He served as the commander of the Metropolitan Borough of Knowsley between 2002 and 2004.
In 2006, he was promoted to Assistant Chief Constable. This is a chief officer rank therefore he joined the Association of Chief Police Officers. Within Merseyside Police he served as ACC Operations and ACC Personnel. In February 2009, he transferred to Greater Manchester Police, becoming Deputy Chief Constable. In 2011, he returned to the Metropolitan Police Service as the Assistant Commissioner for Territorial Policing.
On 24 February 2014, he was selected as the next Chief Constable of Cheshire Constabulary. He took up the appointment on 25 June.