| Men's 100 metre butterfly at the 2025 SEA Games | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Venue | SAT Swimming Pool | |||||||||
| Date | 13 December | |||||||||
| Competitors | 13 from 8 nations | |||||||||
| Winning time | 52.25 | |||||||||
| Medalists | ||||||||||
| ||||||||||
The men's 100 metre butterfly event at the 2025 SEA Games will take place on 13 December 2025 at the SAT Swimming Pool in Bangkok, Thailand.
All times are Indochina Standard Time (UTC+07:00)
| Date | Time | Event |
|---|---|---|
| Saturday, 13 December 2025 | 9:07 | Heats |
| 18:05 | Final |
Prior to this competition, the existing world, Asian, and Southeast Asian Games records were as follows.
| World Record |  Caeleb Dressel (USA) | 49.45 | Tokyo, Japan | 31 July 2021 |
| Asian Record |  Joseph Schooling (SGP) | 50.39 | Rio de Janeiro, Brazil | 12 August 2016 |
| Games Record | Joseph Schooling (SGP) | 51.38 | Kuala Lumpur, Malaysia | 23 August 2017 |
| Rank | Heat | Lane | Swimmer | Nationality | Time | Notes |
|---|---|---|---|---|---|---|
| 1 | 2 | 4 | Quah Zheng Wen | Singapore | 54.06 | Q |
| 2 | 2 | 3 | Jonathan Tan | Singapore | 54.18 | Q |
| 3 | 1 | 5 | Surasit Thongdeang |  Thailand | 54.27 | Q |
| 4 | 1 | 3 | Logan Wataru Noguchi |  Philippines | 54.62 | Q |
| 5 | 2 | 5 | Joe Aditya Wijaya Kurniawan |  Indonesia | 54.68 | Q |
| 6 | 2 | 1 | Jason Donovan Yusuf | Indonesia | 54.87 | Q |
| 7 | 1 | 4 | Bryan Leong Xin Ren |  Malaysia | 55.10 | Q |
| 8 | 2 | 2 | Joran Paul Jamero Orogo | Philippines | 57.08 | Q |
| 9 | 1 | 6 | Dương Văn Hoàng Quy |  Vietnam | 57.16 | R |
| 10 | 2 | 6 | Nguyễn Viết Tường | Vietnam | 57.62 | R |
| 11 | 2 | 7 | Thu Lin Myat |  Myanmar | 1:00.53 | |
| 12 | 1 | 2 | Han Paing Htoo | Myanmar | 1:05.48 | |
| 13 | 1 | 1 | Ryuto Saysanavongphet |  Laos | 1:09.07 |
| Rank | Lane | Swimmer | Nationality | Time | Notes |
|---|---|---|---|---|---|
 | 4 | Quah Zheng Wen | Singapore | 52.25 | |
 | 2 | Joe Aditya Wijaya Kurniawan | Indonesia | 53.14 | |
 | 3 | Surasit Thongdeang | Thailand | 53.32 | |
| 4 | 6 | Logan Wataru Noguchi | Philippines | 53.45 | |
| 5 | 1 | Bryan Leong Xin Ren | Malaysia | 53.86 | |
| 6 | 5 | Jonathan Tan | Singapore | 53.88 | |
| 7 | 7 | Jason Donovan Yusuf | Indonesia | 54.66 | |
| 8 | 8 | Joran Paul Jamero Orogo | Philippines | 56.21 |