| Leung Chun Fai | 2748 | Civil | 1992-01-15 | National University Of Singapore |
| Leung Wai Man | 2727 | Civil | 1991-11-20 | P & T Consultants Pte. Ltd. |
| Lew Chee Keong | 3809 | Civil | 2003-05-20 | National Parks Board |
| Lew Chun Keong | 5436 | Civil | 2022-01-27 | AAPEX Consultants LLP |
| Lew Geok Theng Michelle | 4366 | Civil | 2010-08-19 | Kiso-Jiban Singapore Pte Ltd |
| Lew Yew Wang | 4829 | Civil | 2016-10-18 | JS Tan Consultants Pte. Ltd. |
| Ley Tze Wei | 4870 | Electrical | 2017-04-20 | EcoXplore Pte. Ltd. |
| Li Guojun | 4367 | Civil | 2010-08-19 | Singapore Metro Consultant Pte. Ltd. |
| Li Jun | 5046 | Civil | 2018-04-11 | H Y Engineers Pte. Ltd. |
| Li Kunlin | 4890 | Mechanical | 2017-06-15 | ECAS Consultants Pte. Ltd. |
| Li Qingnan | 5748 | Civil | 2025-03-27 | Ant Consultants Pte. Ltd. |
| Li Xiaojian | 5638 | Electrical | 2024-04-25 | I.EM Engineering Consultants Pte. Ltd. |
| Li Xinxing | 5248 | Electrical | 2019-08-15 | Arup Singapore Private Limited |
| Li Yunlong | 5576 | Chemical | 2023-07-27 | Joyec Solutions Pte. Ltd. |
| Liam Kok Chye | 4057 | Mechanical | 2006-06-20 | Matcor Technology & Services Pte Ltd |
| Lian Sow Meng | 4558 | Electrical | 2013-10-17 | SP PowerGrid Limited |
| Lian Wee Koon | 3904 | Electrical | 2004-07-26 | Whiztip Consultantion Services |
| Lian Zijuan | 5580 | Electrical | 2023-07-27 | SP PowerGrid Limited |
| Liang Choon Yam | 5398 | Electrical | 2021-03-25 | SP Group |
| Liao Binkui | 4845 | Civil | 2017-01-19 | Surbana Jurong Consultants Pte. Ltd. |
| Liau Wai Kun | 4004 | Civil | 2005-09-20 | Keon Consult Pte. Ltd. |
| Liaw Hwee Huat | 3947 | Electrical | 2005-01-18 | J Roger Preston (Singapore) Pte Ltd |
| Liaw Mei Ling | 4760 | Civil | 2016-03-16 | GeoAlliance Consultants Pte. Ltd. |
| Lie Hai Thaw | 5557 | Civil | 2023-06-22 | - |
| Liew Ah Choy | 2939 | Electrical | 1993-07-21 | EquiVolt Pte Ltd |
| Liew Chee Wee | 4571 | Civil | 2013-10-17 | Thymn Pte. Ltd. |
| Liew Chen Hao | 5821 | Mechanical | 2025-11-27 | Sanli M&E Engineering Pte. Ltd. |
| Liew Chiow Yin | 5233 | Civil | 2019-06-20 | AECOM Singapore Pte. Ltd. |
| Liew Choong San @ Liew Nyean Shin | 3085 | Civil | 1995-01-25 | - |
| Liew Jat Yuen Richard | 3749 | Civil | 2002-08-16 | National University Of Singapore |