30 is the fourth studio album by English singer-songwriter Adele. It was released on 19 November 2021 by Columbia Records, as Adele's first studio album since 25 (2015). 30 is inspired by Adele's divorce, motherhood, fame, and heartache, and expresses themes of acceptance and hope. She wrote the album from 2018 through 2020 with producers such as Greg Kurstin, Max Martin and Shellback, all of whom worked on 25 as well. New collaborators included Ludwig Göransson, and Inflo of English band Sault.

Musically, 30 is a pop, soul, and jazz album. Journalists have described it as Adele's most creative work sonically, expanding on her past works by incorporating dance-pop, gospel and jazz elements. American jazz pianist Erroll Garner appears on the track "All Night Parking" as a guest act, marking the first time an artist is featured on a standard album by Adele. The lead single, "Easy on Me", was released on 15 October 2021 and topped the charts in 27 territories. An extensive marketing campaign was used to promote 30, including Adele One Night Only in the US and An Audience with Adele in the UK.

30 reached number one in 23 countries, including the UK where it became Adele's fourth consecutive number-one album, making her the first act to debut all their albums atop the UK Albums Chart; it garnered the highest first-week sales for an album by a female artist in the UK since Adele's own 25 and became 2021's best-seller in the country. In the US, it was Adele's third consecutive Billboard 200 number-one album and also became the best-selling album of 2021. 30 was the world's best-selling album of 2021, selling 4.68 million copies.

30 was met with widespread critical acclaim for its cinematic instrumentation, vocal performances, and introspective lyrics. It appeared on the 2021 year-end best-albums lists from various publications, many of which considered it Adele's best record. The album was nominated for six Grammy Awards at the 65th Annual Grammy Awards (2023), including Album of the Year, Record of the Year and Song of the Year, while "Easy on Me" won Best Pop Solo Performance, making Adele the most awarded artist in the category with 4 wins. 30 won British Album of the Year at the Brit Awards 2022, making Adele the first solo artist in history to win the honor three times.