Can an osprey be used for falconry?

In theory, possibly. However, many traits of the osprey make it nearly impossible to hunt with and even more so to upkeep. For one thing, the birds tend to perch in trees after catching their prey - and what can you offer an osprey that beats a fresh, juicy fish? She simply won't return to you after she's caught her meal.

Ospreys also don't do very well in captivity. They are known for becoming anorectic and refusing to eat.