England
London Metropolitan Police
Ireland
Garda Síochána
USA (NYC)
New York City Police, America
USA
I'm really not sure how the American police system works, but I like Cowboys so I included these happy chappies.
Australia
Australian Federal Police
Austria
Austrian Federal Police
Bundespolizei
China
Chinese People's Armed Police Force
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ZhÅngguó Rénmín WÇ”zhuÄng JÇngchá Bùduì
Belgium
Belgian Federal Police
Federale Politie
Police Fédérale
Germany
Bundespolizei
Brazil
Departamento de Polícia Federal
Canada
Royal Canadian Mounted Police
Catalonia
Mossos d'Esquadra
Denmark
Rigspolitiet
France
The Gendarmerie
Surprisingly ordinary French police were the hardest to find a decent photo of so I thought you might be happy with the Gendarmerie
Greece
The Hellenic Police
Ελληνική Αστυνομία
Israel
Mishteret Yisra'e
משטרת ישר×ל
Palestine
Palestinian National Security Forces
قوات الأمن الوطني الÙلسطيني
Italy
Polizia di Stato
Japan
National Police Agency
Keisatsu-chÅ
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Norway
Norwegian Police Service
Politi- og lensmannsetaten
Poland
Policja
Russia
politsiya
полициÑ
South Africa
South African Police
Spain
National Police Corps
Cuerpo Nacional de Policía
Sweden
Swedish Police Service
Polisen
Vietnam
Vietnam People's Public Security
Công an Nhân dân Việt Nam