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'Game of Thrones' Actor Joseph Gatt Arrested For Contacting Minor For Sexual Offense

"Game of Thrones" actor, Joseph Gatt, has been arrested for allegedly having sexually explicit chats with a minor online ... TMZ has learned.

According to the LAPD ...  the 50-year-old actor was arrested at his Los Angeles home on April 6, after police served a search warrant. Cops got word that Gatt was allegedly engaging in online sexually explicit communication, with a minor.

He was taken into custody and booked on an outstanding felony warrant for contact with a minor for a sexual offense.

In addition to his role as a Thenn Warg in "Game of Thrones," he is also known for his roles in "Thor", "Star Trek Into Darkness" and "Dumbo."

He was released the same day on $5,000 bail.

It's not clear how many minors Gatt is accused of talking to, but the LAPD's Juvenile Division is seeking any other victims ... following his arrest.

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