Bertha Natalie Nettelhorst Hognestad (born 29 May 2000) is a Norwegian born Thai long track speed skater. She was active with a Norwegian license between 2009 and March 2014. Since April 2014 she is active with a Thai license. She represented Thailand at the 2017 Asian Winter Games, becoming the first Thai speed skater at the Asian Winter Games. She participated in the 500 metres event (finishing 17th), 1000 metres event (finishing 18th)and mass start event (did not finish). As of December 2020 she set 27 times a Thai national speed skating record.