Robert Alan Deal (born May 4, 1951), known professionally as Mick Mars, is an American musician and guitarist. He is known for being the lead guitarist for the heavy metal band Mötley Crüe. He was born in Terre Haute, Indiana.
After nearly a decade of frustration with the California music scene, he reinvented himself, changing his name from Robert Deal to Mick Mars and dyeing his hair jet black, hoping for a fresh start. In April 1980 he put a want ad in the Los Angeles newspaper The Recycler, describing himself as "a loud, rude and aggressive guitar player". Nikki Sixx and Tommy Lee, who were putting together a new band which would soon become Mötley Crüe, contacted him. After hearing him play he was hired for the band. Mars has been the guitarist for Mötley Crüe ever since. In 2015, he played with the band on their final tour and soon after announced he was working on a solo album with former Mötley Crüe member John Corabi. In 2018, Vince Neil announced on Twitter that Mötley Crüe would record new songs for the film based on the band's biography The Dirt. In late September of that year, Sixx confirmed that Mars would record the guitars for the songs.