The former Crystal Palace and Stoke manager will take charge at Albion following today’s Premier League game at West Ham and replaces Alan Irvine who was sacked after a run of seven defeats in nine Premier League games left the club a point above the relegation zone.
Pulis told the club’s website: “I’m absolutely delighted to accept the job and I do so with a simple but important message for the Albion fans and everyone at the club.
“Every successful club is built on unity and that is what I shall strive to help bring to Albion.
“We need everyone together from top to bottom – the supporters, all the staff, the players, everyone who has an interest in the club’s welfare.
“With that, we can go forward together and hopefully take this club up the Premier League.”
Pulis will work within a management structure that includes former Wimbledon boss Terry Burton as technical director and Richard Garlick as the director of football administration.
Burton said: “We are delighted to secure a man of Tony’s calibre and proven ability.
“He made it clear that this position excited him and that he was eager to get back into the business of winning Premier League points – and there are few who know how to do it better.”