Muchas Gracias: The Best of Kyuss is a collection by the US band Kyuss, released in 2000, three years after their disbandment by Elektra Records. It includes b-sides, unreleased tracks and four live tracks (Gardenia,Thumb,Conan Troutman,Freedom Run) included in the very rare Live at the Marquee album that came with the first copies of Welcome to Sky Valley.