Gardner relinquishes the role after guiding Corinthians to safety in the Premier Division.
A spokesman for Milnthorpe said: "Following the resignation of Shaun Gardner as 1st team manager we are looking for an enthusiastic and experienced person to fill the post managing the team in the West Lancashire Premier League.
"The club has a very good infrastructure, reserve team and working committee that is looking to improve all the time and welcomes applications from anyone who feels they can match our needs and expectations.
"If you feel this is you please call Chairman Mike Wills in the first instance for an informal chat on 07527709936."
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