Jaanus is an Estonian masculine given name, a version of John.

People named Jaanus include:

Gerd Kanter (born May 6, 1979 in Tallinn, Estonia) is an Estonian discus thrower. He was the 2007 World Champion in the event and won the gold medal at the 2008 Summer Olympics. His personal best throw of 73.38 m is the Estonian record and the third best mark of all-time.

He made his first Olympic appearance in 2004 and established himself a year later by taking the silver medal at the 2005 World Championships. He was runner-up at the 2006 European Athletics Championships and won further medals at the World Championships in 2009 (bronze) and 2011 (silver).

He competed at the 2004 Olympics, but did not reach the final. The season 2005 was his breakthrough year as he won silver medals at the World Championships and World Athletics Final, took home a victory in the European Cup and won the World University Games. He also threw more than 70 metres for the first time.

On September 4, 2006, in Helsingborg, Sweden, Kanter threw more than 70 metres in four different rounds (69.46 – 72.30 – 70.43 – 73.38 – 70.51 – 65.88). The best mark of 73.38 m was an Estonian record and the third best in history – only Jürgen Schult (74.08 m, 1986) and Virgilijus Alekna (73.88 m, 2000) have thrown further.