Monk's departure came just hours after he had guided his team to a 2-1 victory in the Yorkshire derby against Sheffield Wednesday at Hillsborough, their 10th win in 23 Championship games this season.
The 38-year-old's record with Boro was an incredibly close match to his one with Leeds, a win rate of 46.2% compared to 47.2% at Elland Road.
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"The club would like to thank Garry for all his hard work and dedication, and wish him all the best for the future".
Craig Liddle, the club's academy manager, have been placed in charge while Boro search for a new manager.
The decision to sack Monk comes as Boro sit ninth in the Championship, but some 12 points behind the automatic promotion spots.
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The 60-year-old was relieved of his managerial duties at the Hawthorns earlier this season, but could find himself back in the game nearly immediately, with Boro in no doubt that Puilis could be the man to turn their season round and mount a charge at promotion in the second half of the campaign.
Monk took charge of the club in June and was tasked with leading the side back to the Premier League following relegation last season.
Boro were relegated from the Premier League in May after just five wins under Aitor Karanka and then Steve Agnew.
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