Charoen Wattanasin (Thai: เจริญ วรรธนะสิน) (born 1937) is a former badminton player from Thailand who won international championships in the late 1950s and early 1960s.

Between 1958 and 1962 Wattanasin captured the open men's singles titles of Malaya, Ireland, Scotland, Norway, and France.

[1] He also shared the open men's doubles titles of Malaya, Scotland, the Netherlands, and the USA.

[2] Wattanasin was a men's singles runner-up to Denmark's formidable Erland Kops at the All-England Championships in 1960 and 1962.

[5] In 2014, he criticised the European Union's decision to impose political sanctions against Thailand for overthrowing an elected government by stating that Thai people should ban products from the EU, particularly cars, and stop travelling to the EU as well;[6] however, his sons owned BMWs and his daughter was a communication general manager for Chanel Thailand.