Threesome is a Swedish romantic drama television series. The series was created and directed by , with writing by both Linnertorp and . The series follows Siri () and David (Simon Lööf), a Swedish couple in London whose seven-year relationship is tested after a spontaneous, drunken threesome. The first season premiered 29 August 2021 on Viaplay. The series was purchased by SVT Play before the second season premiered 3 July 2024.
The first season premiered on Viaplay on 29 August 2021. In May 2022, it was announced that the series had been renewed for a second season. Promotional stills for the second season were released in April 2023, with the season to be released that autumn. However, due to financial problems at Viaplay, the second season's streaming release was delayed until the series was picked up by SVT Play in 2024.
On the Swedish review aggregator website Kritiker, the series' first season earned an average rating of 4.4/5 based on 6 critics' reviews. The second season received an average rating of 4.4/5 based on 5 critics' reviews.