The Ebbsfleet United boss leaves the club following Tuesday night’s 4-2 home reverse to Torquay United.
It was bottom club Fleet’s third defeat in a row. They had only won once in their previous nine matches.
The news arrives after Hartlepool United’s lunchtime announcement that Craig Hignett’s time was up.
Hill leaves after less than a year at the helm. New assistant manager Kevin Watson takes charge for this weekend’s game with Maidenhead United.
The club have released a statement confirming the former Weymouth and Dagenham boss is leaving.
“Ebbsfleet United have today parted company with manager Garry Hill following Tuesday’s 4-2 defeat at home to Torquay United,” it read.
“The result left Fleet two points adrift at the bottom of the National League table and six from safety.
“Assistant manager Kevin Watson has been placed in charge of first-team affairs and will take charge of the side for this Saturday’s home match versus Maidenhead United.
“The club wishes to place on record its very great thanks to Garry Hill who has worked tirelessly to improve the team’s situation this season.
“He was appointed last November and guided the club from 16th to eighth place, while helping oversee the financial restructuring necessary to the club’s long-term future.”