Simone Venturini, the city's former tourism councillor, took the top job last month and has insisted the fee serves as an important deterrent.
He told The Times that while he didn't want to put a maximum limit on visitors, it was important to spread out visitation – especially at peak times.
Venturini said during his campaign the city could seek permission from the Italian government for higher fees of "€30 to €50".
He has, though, suggested ticket-holders could get discounts for attractions like museums.
The fee was introduced in 2024 at €5 on nearly 30 select peak dates between April and July. This year there will be 60. The fee doubles to €10 for last-minute visitors.
Anyone booking overnight stays in the city are exempt, as are tourists from the wider Veneto region, and children under the age of 14.
Venturini added the fee paid for vital services, and stressed he would seek to find a better balance for residents, workers and visitors.
