S.R.O., is an album by Herb Alpert & the Tijuana Brass, released in 1966. The title stands for "Standing Room Only," which is a term used to describe a sold-out performance where all the available seats are taken and only standing room remains. The album features the hit singles "Work Song" and "Mame," as well as other popular tracks such as "Flamingo" and "Our Day Will Come." It was the seventh album released by the group and reached #2 on the Billboard 200 chart.

Herb Alpert is an American trumpeter who led the band Herb Alpert & the Tijuana Brass in the 1960s. During the same decade, he co-founded A&M Records with Jerry Moss. Alpert has recorded 28 albums that have landed on the U.S. Billboard 200 chart, five of which became No. 1 albums; he has scored 14 platinum albums and 15 gold albums. Alpert is the only musician to hit No. 1 on the U.S. Billboard Hot 100 as both a vocalist and an instrumentalist.