 Argentina
Argentine Air Force - 34 T-28A
Argentine Naval Aviation.
65 ex-French Air Force T-28S Fennec aircraft.
Last nine transferred to Uruguayan naval aviation in 1980.

 Bolivia
Bolivian Air Force at least six T-28Ds.

 Brazil
Brazilian Navy - 18 T-28C
 Democratic Republic of the Congo
Air Force of the Democratic Republic of the Congo - 14 T-28C, 3 T-28B, 10 T-28D
 Cuba
Cuban Air Force - 10
 Dominican Republic
Dominican Air Force
 Ecuador
Ecuadorian Air Force - nine T-28A
 Ethiopia
Ethiopian Air Force - 12 T-28A and 12 T-28D
 France
French Air Force - 148 T-28A airframes modified in France (1959) to make the T-28S Fennec COIN model.

 Haiti
Haitian Air Force - 12 ex-French Air Force
 Honduras
Honduran Air Force - eight former Moroccan Air Force Fennecs.
One delivered, seven others impounded at Fort Lauderdale
 Japan
Japanese Air Self-Defense Force - one T-28B
 Khmer Republic
Khmer Air Force operated 47 T-28s in total in service.

 Laos
Royal Lao Air Force - 55 T-28D
 Mexico
Mexican Air Force - 32 T-28A
 Morocco
Royal Moroccan Air Force - 25 Fennec aircraft 
 Nicaragua
Nicaraguan Air Force - six T-28D
 Philippines
Philippine Air Force - 12 T-28A
 South Korea
Republic of Korea Air Force 
 Saudi Arabia
Royal Saudi Air Force - 25 T-28A
 South Vietnam
Republic of Vietnam Air Force
 Tunisia
Tunisian Air Force - Fennec
 Taiwan
ROC Air Force
 Thailand
Royal Thai Air Force - 88 T-28Ds delivered.
Retired 1984.

 United States
United States Army
United States Air Force - 1194 T-28A, of which 360 converted to "D"
United States Navy - 489 T-28B and 299 T-28C
 Uruguay
Uruguayan Naval Aviation - Fennec 
 Vietnam
Vietnam People's Air Force
 Zaire
Zaire Air Force
 Argentina
Argentine Air Force - 34 T-28A
Argentine Naval Aviation. 65 ex-French Air Force T-28S Fennec aircraft. Last nine transferred to Uruguayan naval aviation in 1980.
 Bolivia
Bolivian Air Force at least six T-28Ds.
 Brazil
Brazilian Navy - 18 T-28C
 Democratic Republic of the Congo
Air Force of the Democratic Republic of the Congo - 14 T-28C, 3 T-28B, 10 T-28D
 Cuba
Cuban Air Force - 10
 Dominican Republic
Dominican Air Force
 Ecuador
Ecuadorian Air Force - nine T-28A
 Ethiopia
Ethiopian Air Force - 12 T-28A and 12 T-28D
 France
French Air Force - 148 T-28A airframes modified in France (1959) to make the T-28S Fennec COIN model.
 Haiti
Haitian Air Force - 12 ex-French Air Force
 Honduras
Honduran Air Force - eight former Moroccan Air Force Fennecs. One delivered, seven others impounded at Fort Lauderdale
 Japan
Japanese Air Self-Defense Force - one T-28B
 Khmer Republic
Khmer Air Force operated 47 T-28s in total in service.
 Laos
Royal Lao Air Force - 55 T-28D
 Mexico
Mexican Air Force - 32 T-28A
 Morocco
Royal Moroccan Air Force - 25 Fennec aircraft 
 Nicaragua
Nicaraguan Air Force - six T-28D
 Philippines
Philippine Air Force - 12 T-28A
 South Korea
Republic of Korea Air Force 
 Saudi Arabia
Royal Saudi Air Force - 25 T-28A
 South Vietnam
Republic of Vietnam Air Force
 Tunisia
Tunisian Air Force - Fennec
 Taiwan
ROC Air Force
 Thailand
Royal Thai Air Force - 88 T-28Ds delivered. Retired 1984.
 United States
United States Army
United States Air Force - 1194 T-28A, of which 360 converted to "D"
United States Navy - 489 T-28B and 299 T-28C
 Uruguay
Uruguayan Naval Aviation - Fennec 
 Vietnam
Vietnam People's Air Force
 Zaire
Zaire Air Force
North American T-28 Trojan