Ellen Martijn Hoog (, born 26 March 1986) is a Dutch field hockey player. She became part of the national team in 2004 and since then has played in 127 matches, scoring 32 goals. She won Olympic gold medals in 2008 and 2012 and a silver medal in 2016. She is a member of the Amsterdamsche Hockey & Bandy Club.
In August 2005, she became European Champion in Dublin (IRL). In December of the same year she won the Champions Trophy in Canberra (AUS) with the Dutch National Women’s Team. She was also part of the Dutch squad that became World Champion at the 2006 Women’s Hockey World Cup.
Her father died of cancer a week after the European Championship victory in Ireland. After his death she had difficulties picking up her normal life again, but regained the motivation to start playing when the new season started in October 2005.
In 2012, Hoog became the first player to decide a major championship match with a penalty shootout, taking the winning shot in the 2012 Summer Olympics semi-final against New Zealand. She repeated this feat in 2016 when she took the winning shot in the 2016 Summer Olympics semi against Germany.