Tomislav "Tomo" Miličević (Croatian pronunciation: [tǒːmo milǐːt͡ʃevit͡ɕ]; born September 3, 1979) is an American musician and record producer. He was the lead guitarist of the rock band Thirty Seconds to Mars from 2003 to 2018. Born in Sarajevo but raised in the United States, Miličević moved to Troy, Michigan in the early 1980s, where he became active in the local heavy metal scene and played in a number of bands, co-founding Morphic. In 2003, he joined Thirty Seconds to Mars, with whom he achieved worldwide recognition in the mid-2000s after recording the band's second album A Beautiful Lie (2005). Its full-length follow-ups, This Is War (2009) and Love, Lust, Faith and Dreams (2013), received further critical and commercial success.