From
GURPS Special Ops, 2nd Edition, by Greg Rose; a fascinating and well-researched sourcebook and a good general read.
(P) indicates a Police unit and (M) is military.
Argentina - Brigada Halcon (P), 601 and 602 Commando Companies (M)
Australia - Special Air Services Regiment (SASR) (M)
Austria - Gendarmerieeinsatzkommando (GEK) (P), Jagdkommando (M)
Bahrain - U-Group (P)
Belgium - Escuadron Special d'Intervetion (P), 1st Special Reconnaisance Company (M)
Bosnia (Muslim) - Black Swans (M)
Brazil - 1st Special Forces Battalion (M)
Cambodia - Battalion 911 (M)
Chile - Grupo de Operaciones Especiales (P), Unidad Anti-Terrorista (M)
China - 6th and 8th Special Warfare Groups (M), 12th Special Warfare SF Detachment (M)
Colombia - Fuerzas Especiales Anti-terroristas Urbanas (M)
Denmark - Aktions Gruppen (AKS) (P), Froemandskorpset (M), Jaegerkorpset (M)
Egypt - Task Force 777 (M)
Finland - Ostato Karhu (P), Utti Light Infantry (M)
France - Deuxieme Regiment Etranger de Parachutistes (2e REP) (M), Groupe d'Intervention de la Gendarmerie Nationale (GIGN) (P)
Germany - Bundesgrenzscchutzgruppe-9 (GSG-9) (P), Kommando Spezialkrafte (KSK) (M)
India - Special Counter-Terrorist Unit, Special Frontier Force (P)
Indonesia - Satgas Gegana, National Police (P), Komando Pasukan Khusus (Kopassus) (M)
Iran - 23rd Special Forces Brigade (M)
Iraq - Special Forces Brigade ("Green Berets") (M)
Israel - Kommando Yami (M), Sayaret Tzanchanim (M), Sayaret Matkal (M)
Italy - Gruppo di Interventio Speciale (P), Nucleo Operativo Centrale di Sicurezza (P/M)
Jordan - 101st Special forces Battalion (M)
Kenya - General Support Unit Recce Company (P)
Malaysia - Special Strike Unit (P)
Myanmar - Special Forces (M)
North Korea - Special Purpose Forces (Commando Brigades) (M)
Pakistan - Special Services Group (M)
Paraguay - Antiterrorist Unit (P)
Philippines - Anti-Terrorist Unit, Crisis Response Battalion (P), Alpha Two Zero (A-20) (M), First Scout Regiment (M), Special Forces Regiment (M)
Poland - 4101st Paratroop Battalion (LRRP) (M)
Russia - Spetsnaz (M), Alpha Group (P), OMON Troops (P)
South Africa - SAPS Special Task Force (P), Recce Commandos (M)
South Korea - Korean National Police 868 Group (P), 707th Special Mission Battalion (M)
Spain - Grupos Especiales de Operaciones (P), Unidad Especial de Intervencion (P/M)
Sri Lanka - Army Commando Squadron (M)
Thailand - Royal Thai Navy SEALs (M)
Turkey - Ozel Inithar Kommando Bolvya (M)
Ukraine - Berkut Detachments (P)
United Kingdom - 22nd Special Air Service Regiment (SAS) (M), Royal Marines 3rd Commando Brigade (M), Royal Marines Special Boat Squadron (M), Comacchio Group (M)
United States of America - US Army Airborne Rangers (M), US Army Special Forces (M), First Special Forces Operational Detachment-Delta ("Delta Force") (M), 160th Special Operations Aviation Regiment (M), US Marine Corps Force Recon Units (M), US Navy SEALs (M), US Air Force Special Operations Command (AFSOC) (M)
Vietnam - "Dac Cong" (Special Forces) (M)