| 13th Southeast Asian Games | |
| Host City: | Bangkok, Thailand |
| Size: | 120px |
| Sports: | 18 |
| Nations: | 8 |
| Opening: | 8 December 1985 |
| Closing: | 17 December 1985 |
| Opened By: | Bhumibol Adulyadej |
| Closed By: | Sanya Dharmasakti |
| Athlete Oath: | Suchart Jairsuraparp |
| Torch Lighter: | Tawee Umpornmaha |
| Ceremony Venue: | National Stadium |
| Previous: | Singapore 1983 |
The 1985 Southeast Asian Games (th|กีฬาแห่งเอเชียตะวันออกเฉียงใต้ 1985|Kila haeng echeiy tawan oak cheing tai 1985), officially known as the 13th Southeast Asian Games, was a Southeast Asian multi-sport event held in Bangkok, Thailand from 8 to 17 December 1985.
This was the fourth time Thailand hosted the games and its first time since 1975. The country had previously hosted the 1959, 1967 and the 1975 editions, at the time when the games were then known as the Southeast Asian Peninsular (SEAP) Games. The games was opened and closed by Bhumibol Adulyadej, the King of Thailand at the Suphachalasai Stadium.
The final medal tally was led by hosts Thailand, followed by Indonesia and the Philippines. Several Games and National records were broken during the games. With little or no controversies at all, the games were deemed generally successful with the rising standard of competition amongst the Southeast Asian nations.
The Bangkok SEA Games Organising Committee was formed to oversee the staging of the games.
| Province | Competition venue | Sports |
| Bangkok | National Sport Complex | |
|---|---|---|
| Opening and Closing Ceremony, Athletics, Football | ||
| Boxing, Gymnastics | ||
| Chanthanayingyong Gymnasium | Judo | |
| Sport Authority of Thailand Sport Complex (Hua Mak) | ||
| Aquatics Centre | Aquatics sport | |
| Football Field | Archery | |
| Volleyball, Sepak takraw | ||
| Shooting Range | Shooting | |
| Sport Training Centre | Table tennis | |
| Tennis Court | Tennis | |
| Velodrome | Cycling | |
| Other | ||
| Basketball, Football | ||
| Badminton | ||
| Kai Siew Treng Hall | Weightlifting | |
| Chonburi | Pattaya Bay | Sailing |
| Star Bowl | Bowling | |
The logo of the 1985 SEA Games is the Grand Palace, one of the most popular tourist attractions in Thailand.
The official 1985 SEA Games mascot was a Siamese cat.The Siamese is one of the first distinctly recognised breeds of Oriental cat. It is called Wichien-maat (th|วิเชียรมาศ) in Thailand.