Miķelis Ļaksa (born October 2, 1986), known as Markus Riva, is a Latvian musician and producer. He has released several albums, including the debut album Ticu (2009). Riva worked at Capital FM as a DJ, and has composed music for various television shows. He has competed repeatedly in Latvia's national selection for the entrant to the Eurovision Song Contest. In 2017, Riva hosted the TV3 show X Faktors Latvia.