Known close friendships:
* Daniel Radcliffe and Rupert Grint: They have been close friends since the very beginning of filming, calling each other "best friends" and remaining close even after the films ended. They even starred together in the play "It's Only a Play" in 2014.
* Emma Watson and Tom Felton: They have a close bond that goes beyond the film set, with Emma even calling Tom her "first crush."
* Bonnie Wright (Ginny Weasley) and Matthew Lewis (Neville Longbottom): They have been friends for years, with Bonnie even stating in interviews that Matthew is one of her closest friends.
* Rupert Grint and James Phelps (Fred Weasley): They are known to be close, often seen together at events and supporting each other's projects.
Other strong relationships:
* The Weasley family: The actors who played the Weasleys, including Rupert Grint, Bonnie Wright, James and Oliver Phelps, are known to be very close and regularly socialize together.
* The Golden Trio: While not as open about their friendship as Radcliffe and Grint, Emma Watson, Daniel Radcliffe, and Rupert Grint have always expressed mutual respect and fondness for each other.
* The "Hogwarts" cast: Many members of the cast, especially those who played students, have spoken about the strong bond they formed during the filming process, even if they haven't all remained close friends in the years since.
Important to note:
* Some actors might have strong friendships that are less public.
* People's relationships can evolve over time, so what was a close friendship during filming might not be the same years later.
* It's crucial to respect the privacy of the actors and not speculate excessively about their personal lives.
Overall, the Harry Potter cast formed strong bonds during the filming process, with many friendships continuing beyond the films. While we may not know every detail of their relationships, it's clear that many of them have a special connection that goes beyond the wizarding world.