| Thammanoon Sriroj | |
| Birth Date: | 24 June 1969 |
| Residence: | Plutaluang, Thailand |
| Yearpro: | 1991 |
| Tour: | All Thailand Golf Tour Japan PGA Senior Tour |
| Extour: | Asian Tour |
| Prowins: | 18 |
| Asiawins: | 5 |
| Otherwins: | 13 |
| Masters: | DNP |
| Usopen: | DNP |
| Open: | CUT: 2005 |
| Pga: | DNP |
| Award1: | All Thailand Golf Tour Order of Merit winner |
| Year1: | 2002, 2005, 2009 |
Thammanoon Sriroj (born 24 June 1969) is a Thai professional golfer who plays on the Asian Tour. He has five Asian Tour wins and was one of the first ten men to reach one million dollars in Asian Tour career earnings. He has five brothers who are professional golfers and is a cousin of Asian Tour golfer Chawalit Plaphol, with whom he represented Thailand in the 2000 WGC-World Cup.
| No. | Date | Tournament | Winning score | Margin of victory | Runner-up | |
|---|---|---|---|---|---|---|
| 1 | 31 Mar 1996 | Singha Thai Prasit Bangkok Open | −14 (67-71-68-68=274) | 1 stroke |  Stephen Scahill | |
| 2 | 1 Dec 1996 | Tugu Pratama Indonesian PGA Championship | −14 (67-66-74-67=274) | 1 stroke | Chua Guan Soon | |
| 3 | 19 Oct 1997 | ABN-AMRO Pakistan Masters | −14 (67-70-68-69=274) | Playoff |  Scott Laycock | |
| 4 | 22 Aug 1999 | Tianjin TEDA Open | −13 (65-70-65-67=267) | 1 stroke |  Park No-seok | |
| 5 | 22 Aug 2004 | Tianjin TEDA Open (2) | −19 (64-67-69-65=265) | 1 stroke |  Boonchu Ruangkit |
Asian Tour playoff record (1–2)
| No. | Year | Tournament | Opponent | Result | |
|---|---|---|---|---|---|
| 1 | 1997 | Sabah Masters |  Des Terblanche | Lost to birdie on third extra hole | |
| 2 | 1997 | ABN-AMRO Pakistan Masters | Scott Laycock | Won with birdie on second extra hole | |
| 3 | 2005 | Bangkok Airways Open |  Lu Wen-teh | Lost to par on first extra hole |
1Co-sanctioned by the ASEAN PGA Tour