The 5'11, 102kg hooker has a wealth of experience in the number 2 jersey having played for Saracens in the English Premiership for the past 2 seasons.
This will not be Ethienne's first visit to the Sportsground, the 29 year old was part of the Saracens squad that visited Connacht last August for a pre-season friendly.
Speaking about the move Ethienne said:
"I'm very excited at the prospect of going to Ireland, especially Galway. Connacht has shown this season they are serious about establishing a strong and successful rugby culture there, and I intend giving my all to contribute to the cause."
Head coach Eric Elwood:
"With Sean moving on at the end of the season we needed cover at hooker and we are very pleased to sign a player of Ethienne's calibre, especially in such a crucial position. He is an experienced player who we are confident can offer a lot to Connacht."