Chapchai Nirat (; born 5 June 1983) is a Thai professional golfer.
Chapchai is the son of a Thai national team golfer, and turned professional in 1998 as a fifteen-year-old. He won for the first time as a pro at the 2004 Genting Masters in Malaysia. He joined the Asian Tour in 2005, and had a second-place finish in his rookie season. In 2007 he won the TCL Classic, which is co-sanctioned by the Asian Tour and the European Tour and the Hana Bank Vietnam Masters. He was the third Thai to win a European Tour event.
In March 2009, Nirat shot 32-under-par over 72 holes to claim the SAIL Open, setting a new Asian Tour record for the best 72-hole score.
<sup>1</sup>Co-sanctioned by the Asian Tour
<sup>1</sup>Co-sanctioned by the European Tour
Asian Tour playoff record (1âÂÂ1)
<sup>1</sup>Co-sanctioned by the All Thailand Golf Tour
<sup>1</sup>Co-sanctioned by the ASEAN PGA Tour<br> <sup>2</sup>Co-sanctioned by the Asian Development Tour
"T" = Tied<br> Note that the HSBC Champions did not become a WGC event until 2009.