Arsenie Todiras (sometimes spelt Toderas) (born July 22, 1983) is a Moldovan singer who was the youngest member of the former boyband O-Zone. He now pursues a solo career in Romania, under the stage name Arsenium. Arsenie sang at the Eurovision Song Contest 2006 as representative of Moldova with his song "Loca" (Crazy in Spanish) with Natalia Gordienko featuring Connect-R, finishing in 20th place with 22 points.

He took part in the Dansez Pentru Tine Dance Contest, the Romanian version of Dancing with the Stars, and took the second place, while the first was given to the Romanian singer Andra.

His first album, The 33rd Element, was released in Romania in the summer of 2006, releases in other countries (such as Russia, Spain, Ukraine, Poland etc) are to follow.