This year marks 100 years since the iconic Negroni was first concocted.
The cocktail has just three ingredients: dry gin, vermouth, and Campari but is well known as a classic apéritif.
Negroni week started on Monday and over 12,000 bars and restaurants are participating around the world.
Restaurants in New York City joined the celebrations.
Harry's, a bar and restaurant established in 1972 and located right near the New York Stock Exchange is one of the establishments taking part.
“In the last 4 or 5 years, we have seen a huge resurgence in the enthusiasm for classic drinks, so Negroni was a perfect fit for a Wall Street institution like Harry’s," said Faith O'Gorman, the director of business development at Harry's.
The legend of Negroni says Count Camillo Negroni asked a bartender in Florence, Fosco Scarselli, if he could add a splash of something stronger in his "Americano" which was a well-known cocktail of bitters and vermouth.
"Negroni had been a cowboy in Montana and Alberta, Canada, and a gambler and a fencing instructor in New York City for a number of years. He was pretty sporty, probably absorbed some American habits," said the Daily Beast's senior drink columnist and author David Wondrich. "He wanted this drink a little bit stronger."
Negroni's story was notably told in Florentine drink historian Luca Picchi's book Negroni Cocktail: An Italian Legend.
Negroni Week has 46 official charity partners.
Bars and restaurants pick a charity when they sign up for Negroni Week. To date, the venues have raised about $2 million for charitable causes.
Watch Euronews correspondent Michela Monte's report in the video player above.