Shopping on Fifth Avenue just isn’t what it used to be.

With just two weeks before the crushing crowds of holiday shoppers and tourists descend on the Big Apple, some of the swankiest retailers near President-elect Trump’s private residence on Fifth Avenue are wondering if this will be the worst season ever.

The tight ring of security surrounding Trump Tower between 56th and 57th streets, where protestors have been gathering since Election Day night, is creating an environment of fear rather than festivity.

“Some high-end shoppers may not even want to go there now,” said Tom Cusick, president of the Fifth Avenue Business Improvement District, which has been fielding calls from anxious members.

“There is very sharp concern by the retailers located between 56th and 57th streets,” which include Tiffany & Co., Gucci, Prada and Piaget, Cusick added.

In just 15 days, pedestrian traffic along the swank stretch of Fifth Avenue is expected to soar, from the usual 400 people an hour to an astounding 10,000-12,000 an hour.

In an attempt to avert a possible financial disaster, Cusick has requested a meeting with NYPD and Secret Service officials who have initially indicated that the tight ring of security — complete with officers carrying assault-style rifles — will continue until Jan. 20 when Trump is inaugurated.

But if Trump chooses his Fifth Avenue apartment over Mar-a-Lago, his Florida compound, for his official residence when he’s not at the White House, the gridlock could continue for the next four years.

“Would the head of the president’s security team prefer to have him in a different, less populated environment? Of course,” said Anthony Roman, chief executive of security firm Roman & Associates. “But it’s not their choice, and Trump’s power base is in New York, not Washington.”

Meanwhile, Tiffany — located next door to Trump Tower — is seeing a falloff in customers and even had to cancel a Thursday night event.

Jewelry designer Eddie Borgo had planned a Nov. 10 bash at the famous store. It was postponed “due to post-election related activity along Fifth Avenue,” the designer said in an e-mail to guests.

Most retailers seem to have been instructed either by their corporate offices or security officials not to discuss the security issue.

An employee at Oxxford Clothes on 56th Street near Fifth, where customers have to ask police to move barricades to let them into the store, said he is not permitted to discuss the situation or to say who has forbidden it.

Workers at Armani Ristorante next door were also told not to comment.

But the restaurant’s hostess and general manager on Friday fussed over four customers who had troubled getting in to have lunch.

Some customers were not able to get in, the hostess said.

“It’s so arbitrary,” she said.

Additional reporting by Ian Mohr