La Ronde (also known by its original German title, Reigen)[1] is a play in which ten people form an unwitting interpersonal circle with their secret sexual relationships.

By choosing characters across all levels of society, the play offers social commentary on how sexual contact transgresses class boundaries.

"[4] Despite a 1921 Berlin court verdict that dismissed the charges of immorality, Schnitzler withdrew La Ronde himself from public production in German-speaking countries.

In 1922, Sigmund Freud wrote to Schnitzler: "You have learned through intuition – though actually as a result of sensitive introspection – everything that I have had to unearth by laborious work on other persons."

In 1989, Mihály Kornis re-located its action to communist-era Hungary, rendering the Young Gentleman and the Husband as communist politicians.

A group-written version, set on an Australian Federal election night and Sydney Mardi Gras, and presented as a part of the Sydney Festival in January 2002, 360 Positions in a One Night Stand, by Ben Ellis, Veronica Gleeson, Nick Marchand, Tommy Murphy, and Emma Vuletic,[6] and directed by Chris Mead.

[7] There have been four notable gay versions of the story: Eric Bentley's Round 2 (1986) is set in New York in the 1970s; Jack Heifner's Seduction and Michael Kearns's pro-safe-sex piece Complications (2004) (Complications was remade as Dean Howell's film Nine Lives); and Joe DiPietro's Fucking Men (2008) (which is set in contemporary New York).

[8] Suzanne Bachner created an adaptation examining 21st-century mores, including, straight, gay, and bisexual characters entitled Circle.

[14] Reigen, a 1993 German-language operatic adaptation by Philippe Boesmans, premiered at La Monnaie, Brussels in 1993, and subsequently recorded.

In his autobiography, Never Have Your Dog Stuffed: and Other Things I've Learned, Alan Alda says that for the first story he wrote for M*A*S*H (an episode titled "The Longjohn Flap"), he borrowed the structure from La Ronde.