| Ong Ken-Jeen | Certificate In Legal Practice (CLP) |
| Ong Keng Swee | Lincoln's Inn |
| Ong Khan Lee | Bond University, Queensland |
| Ong Kheng Guan | Certificate In Legal Practice (CLP) |
| Ong Kheng Leong | Lincoln's Inn |
| Ong Kian Hock | Certificate In Legal Practice (CLP) |
| Ong Kian Siang | Multimedia University (MMU) |
| Ong Kim Hong | Universiti Utara Malaysia (UUM) |
| Ong Kit Wee | Universiti Kebangsaan Malaysia (UKM) |
| Ong Kok Bin | Middle Temple |
| Ong Kok Wah | Certificate In Legal Practice (CLP) |
| Ong Kow Meng | Certificate In Legal Practice (CLP) |
| Ong Lam Kiat, Vernon | Lincoln's Inn |
| Ong Lay Hwa | University Of Tasmania |
| Ong Lay Pooi | Certificate In Legal Practice (CLP) |
| Ong Lay Xuan | Universiti Utara Malaysia (UUM) |
| Ong Lee Fong | Certificate In Legal Practice (CLP) |
| Ong Lee Xuan | Universiti Utara Malaysia (UUM) |
| Ong Lee Yin | Universiti Malaya (UM) |
| Ong Let Wei | Lincoln's Inn |