Maria Lvovna "Masha" Katz (Russian: Мари́я Льво́вна "Ма́ша" Кац; born 23 January 1973), also known by her stage name Youddiph (Russian: Юди́фь, romanized: Yudif, lit. 'Judith'), is a Russian singer. She is best known for representing Russia in the Eurovision Song Contest 1994 held in Dublin, the first time Russia has competed in the competition.