The city Republican Party is in shambles — engulfed by infighting and weak leadership that damages whatever chances its nominee has of winning City Hall this fall, alarmed GOP insiders told The Post.

“What’s happened to the city Republican Party is sorrowful. It’s a damn shame. It’s never been this bad,” said Guy Molinari, a former Staten Island borough president and congressman.

Another veteran GOP operative said, “There’s not a single leader pulling the Republican county chairmen together. And the county chairmen are fighting with their elected council members.”

Among the party troubles:

* It has become irrelevant in Manhattan and The Bronx, where there is not one elected Republican.

* GOP presidential candidates raise millions of dollars from Manhattanites, but the New York County committee is virtually broke.

* The Queens GOP is bitterly divided. Two of its veteran state senators were defeated in recent years, and it no longer has any representation in that body.

* A civil war is brewing in the mighty Staten Island GOP. County Chairman Bob Scamardella announced his resignation last week after a dispute with elected officials, particularly its borough-president candidate, Councilman James Oddo.

* Brooklyn’s party is splintered. Chairman Craig Eaton, Sen. Marty Golden and Assemblywoman Nicole Malliotakis are all backing different mayoral candidates.