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The Australian has been in the job since November 2017 and guided the Gunners to the 2018-19 Women s Super League title as well as the League Cup in 2018.
Arsenal said in a statement that Montemurro, whose side are currently fourth in the WSL table, had decided to take a professional break to recharge and dedicate more time to spending with his family .
The 51-year-old Montemurro, well-liked and respected throughout the sport, said he had made the decision in February and that it had been the hardest professional decision of my life, as I absolutely love this job and this club, the club I have supported all my life.