 Argentina
Argentine Air Force
Argentine Naval Aviation – 1 W34 purchased in 1934, used as trainer 
 Australia
Guinea Airways
Royal Australian Air Force
 Bolivia
Bolivian Air Force
 Brazil
Syndicato Condor – Serviços Aéreos Condor
 Bulgaria
Bulgarian Air Force
 Canada
Royal Canadian Air Force
Canadian Airways
 Chile
Chilean Air Force
 China
Chinese Nationalist Air Force
 Colombia
Colombian Air Force
SCADTA(Avianca)
 Independent State of Croatia
Zrakoplovstvo Nezavisne Države Hrvatske
 Czechoslovakia
Czechoslovak Air Force
 Finland
Finnish Air Force
Finnish Border Guard
 Germany
Luftwaffe
 Norway
Royal Norwegian Air Force
 Papua New Guinea
 Portugal
Portuguese Army Aviation (Aeronáutica Militar) operated W 34L aircraft.

Forças Aéreas da Armada operated K 43W aircraft.

 Slovakia
Slovak Air Force (1939–45)
 Spanish State
Spanish Air Force
 Sweden
Swedish Air Force
 South Africa
South African Airways operated 2 aircraft.

South African Air Force
 Venezuela
Venezuelan Air Force
 Argentina
Argentine Air Force
Argentine Naval Aviation – 1 W34 purchased in 1934, used as trainer 
 Australia
Guinea Airways
Royal Australian Air Force
 Bolivia
Bolivian Air Force
 Brazil
Syndicato Condor – Serviços Aéreos Condor
 Bulgaria
Bulgarian Air Force
 Canada
Royal Canadian Air Force
Canadian Airways
 Chile
Chilean Air Force
 China
Chinese Nationalist Air Force
 Colombia
Colombian Air Force
SCADTA(Avianca)
 Independent State of Croatia
Zrakoplovstvo Nezavisne Države Hrvatske
 Czechoslovakia
Czechoslovak Air Force
 Finland
Finnish Air Force
Finnish Border Guard
 Germany
Luftwaffe
 Norway
Royal Norwegian Air Force
 Papua New Guinea
 Portugal
Portuguese Army Aviation (Aeronáutica Militar) operated W 34L aircraft.
Forças Aéreas da Armada operated K 43W aircraft.
 Slovakia
Slovak Air Force (1939–45)
 Spanish State
Spanish Air Force
 Sweden
Swedish Air Force
 South Africa
South African Airways operated 2 aircraft.
South African Air Force
 Venezuela
Venezuelan Air Force
Junkers W 34