The 3rd IOS 2015 was organized by DBKU from 10-13 September 2015 at Orchid Garden. The opening ceremony was officiated by Sarawak Minister of Tourism.
13 countries participated in the 3rd IOS 2015 namely from Japan, China, Korea, Hong Kong, Taiwan, Myanmar, Vietnam, The Phillipines, Thailand, Singapore, Brunei, Indonesia and Malaysia.
17 landscape exhibitions were displayed during the show. Among the categories of competitions organised were:
1) International Orchid Display and Competition
2) Local Orchid Display and Competition
3) School Orchid Display and Competition
4) Individual Orchid Competition
5) Flower Arrangement Competition
This 3rd IOS received 15,000 visitors.