Big Leaves were a Welsh rock band formed in 1988, originally named Beganifs. They disbanded in 2003, with two members subsequently forming Sibrydion.

The band was formed in 1988 as Beganifs by then 11- and 12-year-old school pupils Rhodri Sion (vocals), Meilir Gwynedd (guitar), Kevin Tame (bass guitar, trumpet), and Osian Gwynedd (drums, keyboards).^[1][2] They initially recorded and sold home-recorded tapes, and released two seven-inch EPs as Beganifs, the first on their own label, the second on Ankst Records.^[2] They changed the band name to Big Leaves after they were mistakenly billed as this by a concert promoter in the Netherlands who misheard their name.^[2][3] They were signed by Crai Records, releasing two EPs in 1998 and 1999, and contributed to the second album by Catatonia, with whom they later toured.^[2] They also toured with Super Furry Animals, a band with which they have been compared.^[2][4] "Sly Alibi", released in 1999 on Adam Walton's Whipcord label, was the band's first English-language release.^[1] Their 1999 single "Racing Birds" was so highly regarded by BBC Radio 1 DJ Mark Radcliffe that he played it twice in a row on his show.^[4] The band's debut album, Pwy Sy'n Galw? (Who's Calling?) was released in 2000, after which they were joined by drummer Matt Hobbs.^[2] The band performed at the South by Southwest festival in Austin, Texas in 2002, and were featured in a documentary on S4C.^[2]

They released a second album in 2003, after which the band split up.^[3] Meilir and Osian Gwynedd later formed Sibrydion.