| Leong Kum Loi | 2747 | Civil | 1992-01-15 | ATC Consulting Pte. Ltd. |
| Leong Kwok Kee Stephen | 4542 | Civil | 2013-10-17 | Centre Stringer Consulting |
| Leong Meng Sun | 4144 | Civil | 2007-02-23 | CPG Consultants Pte Ltd |
| Leong Mum Chun Kenneth | 5563 | Electrical | 2023-06-22 | SP PowerGrid Limited |
| Leong Mun Tin | 3601 | Mechanical | 2000-11-28 | Gentech Engineering Pte Ltd |
| Leong Pei Ying | 5502 | Civil | 2023-01-26 | JTC Corporation |
| Leong Qian Wei | 5546 | Electrical | 2023-05-18 | Energy Market Authority |
| Leong Shee Kok | 2591 | Electrical | 1990-08-15 | SKL Engineering Services |
| Leong Siew Hay | 1475 | Mechanical | 1980-08-19 | - |
| Leong Sow Hon | 2662 | Civil | 1991-04-17 | Brown Consulting Pte. Ltd. |
| Leong Wai Hoo | 3901 | Mechanical | 2004-07-26 | United Engineering & Consultancy Services |
| Leong Wai Tak | 3579 | Civil | 2000-08-15 | Jacobs International Consultants Pte. Ltd. |
| Leong Wei Wen | 5885 | Mechanical | 2026-04-23 | Changi Airport Planners And Engineers Pte. Ltd. |
| Leong Weng Hong | 4776 | Mechanical | 2016-05-13 | - |
| Leong Weng Kheong | 2846 | Electrical | 1992-07-15 | LWK Services |
| Leong Weng Kwai | 2605 | Electrical | 1990-10-16 | - |
| Leong Yat Seng | 2144 | Electrical | 1985-04-16 | LYS Associates & Consultancy Services Pte. Ltd. |
| Leong Yee Thye | 1778 | Mechanical | 1982-06-09 | Harnical Engineering Pte Ltd |
| Leong Yen Ming | 3357 | Civil | 1997-09-16 | Millenniums Consultants Pte. Ltd. |
| Leong Yew Ping | 5375 | Civil | 2021-01-21 | AAPEX Consultants LLP |
| Leow Ban Joo | 3266 | Civil | 1996-08-07 | Mott MacDonald Singapore Pte Limited |
| Leow Geok Mui | 4072 | Civil | 2006-09-19 | TW-Asia Consultants Pte. Ltd. |
| Leow Jun Qiang | 5381 | Electrical | 2021-01-21 | Housing & Development Board |
| Leow Su Hock | 5579 | Electrical | 2023-07-27 | MOH Holdings Pte Ltd |
| Leow Wei Zheng | 5214 | Electrical | 2019-04-18 | LC Engineering Services Pte. Ltd. |
| Leow Whye Mong | 2620 | Civil | 1991-02-20 | WM Leow & Associates |
| Leow Yock Keng | 5519 | Mechanical | 2023-03-23 | Building and Construction Authority |
| Leow Yung Guan | 3921 | Civil | 2004-09-21 | Sentosa Development Corporation |
| Leslie Earnest | 3423 | Electrical | 1998-07-21 | CPG Facilities Management Pte Ltd |
| Leung Chiu Kin | 3109 | Civil | 1995-03-15 | Aurecon Singapore (Pte.) Ltd. |