Roger Manganelli (born December 13 in Porto Alegre, Brazil), is the bassist and one of the two singers for ska-punk band Less Than Jake. He is also lead singer and guitarist for his other band, the faster punk rock band Rehasher, and more recently formed the trio Greenhorn (for whom he plays drums). When not playing with a band, Manganelli is either working with toys and airplanes or developing his home studio Moathouse Productions.

Roger's employment history includes working at Knuckleheads, a smoke shop in Gainesville, Florida which was later transformed into a similar establishment named Smoke before going out of business.