The Policing Authority has congratulated the achievement of the Garda Commissioner Drew Harris, who features in Queen Elizabeth's birthday honours' list.
Commissioner Harris,who has 35 years' service as a police officer, has been awarded the Queen's Police Medal for his services in Northern Ireland.
He was the deputy chief constable of the PSNI from 2014 until 2018.
He said: "I'm very honoured and pleased to receive this award".
Meanwhile, retiring PSNI chief constable George Hamilton has been awarded a knighthood.
Popular priest and broadcaster, Fr Brian D'Arcy from Co Fermanagh, is also to receive an OBE.