 Australia
 Tasmania – two for commercial use, carrying six passengers or a ton (2,240 lb) of freight
 Canada
Canadian Air Board
 Portugal
Portuguese Navy
 Spain
Aeronáutica Naval España
Spanish seaplane carrier Dédalo – three carried
 United Kingdom
Royal Naval Air Service
Royal Air Force
No.
232 Squadron RAF
No.
234 Squadron RAF
No.
238 Squadron RAF
No.
249 Squadron RAF
No.
261 Squadron RAF
No.
263 Squadron RAF
No.
265 Squadron RAF
No.
267 Squadron RAF
No.
269 Squadron RAF
No.
270 Squadron RAF
No.
271 Squadron RAF
 United States
United States Navy
 Australia
 Tasmania – two for commercial use, carrying six passengers or a ton (2,240 lb) of freight
 Canada
Canadian Air Board
 Portugal
Portuguese Navy
 Spain
Aeronáutica Naval España
Spanish seaplane carrier Dédalo – three carried
 United Kingdom
Royal Naval Air Service
Royal Air Force
No. 232 Squadron RAF
No. 234 Squadron RAF
No. 238 Squadron RAF
No. 249 Squadron RAF
No. 261 Squadron RAF
No. 263 Squadron RAF
No. 265 Squadron RAF
No. 267 Squadron RAF
No. 269 Squadron RAF
No. 270 Squadron RAF
No. 271 Squadron RAF
 United States
United States Navy
Felixstowe F.3