Viggo Mortensen purchased the horse who played the title character (T.J.) after this film was completed.
Five American Paint Horse Association registered Paint Horses played the role of Hidalgo.
The final horse scene was filmed in Browning, Montana. 550 different horses were used in that scene. The horses all came from different owners, so to tell them apart, their hooves were branded.
In Mexico the title was changed to "Océano de Fuego" (Ocean of Fire) because Hidalgo was the last name of one of the founding fathers, so it would have been misleading.
When distributed in Egypt, the Arabic translation of "fifth wife" is "fourth wife" since in Islam you are not permitted to have more than four wives. See also the goofs.
Halfway through the film's original theatrical trailer, "Going The Distance", a Bill Conti composition from Rocky (1976) is used. It appears to be a new orchestration.
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