Aiga Grabuste (born 24 March 1988, in Rēzekne) is a Latvian track and field athlete competing in heptathlon. She represented her country at the 2008 Beijing Olympics and won bronze medal at the 2012 European Athletics Championships, finishing just 10 points behind fellow Latvian Laura Ikauniece. She set a then personal best of 6396 points at the 2009 European Athletics U23 Championships in Kaunas, winning the gold medal. Grabuste was also the 2007 European Junior champion in heptathlon.