Satu Karoliina Lundahl (born June 30, 1968 in Helsinki) is a retired female weightlifter from Finland, who was nicknamed "Kartsi" during her career.
She started as a shot putter, competing for her native country at the 1996 Summer Olympics.Lundahl won the Finnish championships in 1994, 1996 and 1998.Lundahl later started a career in weightlifting, winning the gold medal at the 1998 World Weightlifting Championships in Lahti.
She also competed in this discipline at the 2000 Summer Olympics in Sydney, Australia.