The 36-year-old leaves the club at which he has spent the last 14 years, ending his playing career at the Liberty Stadium to manage the team in February 2014.
After guiding the club to their second-highest league finish last season – eighth in the Premier League – the Swans have struggled for results this term and lost eight of their last 12 matches in all competitions.
Announcing Monk’s departure on Wednesday, chairman Huw Jenkins said: “The decision has been made very reluctantly and with a heavy heart.
“To find ourselves in our current situation from where we were in the first week of September, and considering the drop of performance levels and run of results over the last three months, it has brought us to this unfortunate decision today.
“Garry took on the job 22 months ago with the backing of everyone at the club. And when you take into account the excellent campaign we had last season when we broke all club records in the Premier League, nobody foresaw the position we would be in at this moment in time.
“Bearing that in mind and the current uncertainty around the club, we felt the situation needed clarity to move forward. It was not a decision we took lightly, especially given Garry’s history and standing within the club.
“And it goes without saying that we wish Garry all the very best for the future and thank him for his tremendous service, not only as a player over the last decade, but also as our manager. He will always have a warm welcome at this football club.
“We hope to appoint a replacement as soon as possible.”
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