Daniel Arnamnart (born 14 September 1989) is an Australian competitive swimmer who specialises in backstroke events.

[1] Arnamnart completed at the 2006 Australian Short Course Swimming Championships reaching the finals of all three backstroke events.

On the back of these results he was named in the team of 30 to represent Australia at the second edition of the Junior Pan Pacific Swimming Championships held in Maui, Hawaii, in January 2007.

[5] Daniel Arnamnart qualified for the 2012 Olympics by winning silver medal in the 100-metre backstroke at the Australian Swimming Championships in Adelaide with a time of 54.05.

[6] At the 2012 Summer Olympics in London, Arnamnart competed in the preliminary heats of the 100-metre backstroke, and finished with the 16th-best time overall, qualifying for the semifinals.