Leidseplein (English: Leiden Square) is a square in central Amsterdam, Netherlands. It lies in the Weteringschans neighborhood (Centrum borough), immediately northeast of the Singelgracht. It is located on the crossroads of the , Marnixstraat and .
Leidseplein is one of the busiest centres for nightlife in the city. Historically, the square was the end of the road from Leiden; it served as a parking lot for horse-drawn traffic. Today, modern traffic travels through the square and side streets are packed with restaurants and nightclubs. The Stadsschouwburg, a national-renowned theatre, is the most notable architectural landmark on the square; the American Hotel is close by.
On February 22, 2022, a 27 year old man took at least one person hostage inside of an Apple Store in Leidse Square. After a forced breach of the store by Dutch Police, all hostages were safely rescued. However, as a result of the breach, the hostage taker was killed. The 2025 Dutch film iHostage dramatises the incident.
It is approximately from where well known crime reporter Peter R. de Vries, a key figure in the Marengo trial, was murdered.