A fierce dispute has erupted between Mayor Bloomberg and other top city officials over whether the public is entitled to know the names and earnings of some 300,000 members of the city’s largest pension system, The Post has learned.

On Tuesday, Carolyn Wolpert, the mayor’s representative on the mammoth New York City Employees Retirement System, introduced a motion before the 11-member board to release the data at once.

But Wolpert could line up only one supporter, Staten Island Borough President Jim Molinari.

The other borough presidents sided with three union representatives and the motion went down to swift defeat.

Public Advocate Bill de Blasio and Comptroller John Liu — both potential mayoral contenders who have close ties to municipal unions — abstained.

They cited ongoing litigation involving the police pension board and the Empire Center, a watchdog group that posts on its Web site the names, retirement dates and pensions of former government employees from around the state.

The Empire Center sued the NYPD pension system last year for refusing to turn over its list of retired cops, claiming their safety might be jeopardized.

The state police pension system had no such qualms, countered the Empire Center.

The other four boards, which had routinely shared their lists of retirees, instantly followed the NYPD system’s lead and also went into lockdown mode.

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