The game Five Nights at Freddy’s 3 has already been released; it came out on March 2, 2015 on PC.
Game release
Five Nights at Freddy’s 3 is the third main game in the FNAF series and was launched as a single‑player survival horror title for PC platforms on March 2, 2015. It later became available on additional platforms through ports and collections, but the original release date is in early 2015.
If you meant the movie
If you are asking about a potential Five Nights at Freddy’s 3 movie, there is no officially announced release date yet. Industry reports and rumors suggest filming could begin around 2026 with a possible 2027 release window, but the studios have not confirmed this, so plans may change.
