| Low Seow Wee | 3385 | Civil | 1998-04-21 | Brown Consulting Pte. Ltd. |
| Low Wan Ping | 5667 | Electrical | 2024-07-26 | PSA Corporation Limited |
| Low Wee Lee | 4901 | Civil | 2017-07-18 | JTC Corporation |
| Low Wong Fook @ Low Kong Fook | 0537 | Mechanical | 1972-10-25 | - |
| Low Xuan Yi, Alan | 5712 | Mechanical | 2024-10-24 | Sembcorp Architects & Engineers Pte. Ltd. |
| Low Yut Peng | 2586 | Civil | 1990-08-15 | Excel Precast Pte Ltd |
| Loy Teck Tong Jason | 4093 | Mechanical | 2006-11-21 | J-Loy Consulting Services |
| Lu Junwei | 5577 | Electrical | 2023-07-27 | Aurecon Singapore (Pte.) Ltd. |
| Lu Lu | 5220 | Civil | 2019-05-16 | - |
| Lu Min Thet | 4379 | Mechanical | 2010-11-18 | LTP Consultants |
| Lu Qimin | 4675 | Electrical | 2015-04-16 | Hong Bee Electrical & Engineering Pte Ltd |
| Lu Tu | 5803 | Electrical | 2025-10-23 | DSCO Group Pte. Ltd. |
| Lu Yirun | 5853 | Electrical | 2026-02-26 | I2R Engineering Solutions Pte Ltd |
| Lu You | 5112 | Civil | 2018-07-19 | Changi Airport Planners And Engineers Pte. Ltd. |
| Lucas Ng Hong Kiang | 4866 | Chemical | 2017-03-23 | LUKE Operations Excellence & Sustainability Consultancy |
| Lucia Antonius | 5609 | Mechanical | 2024-01-25 | JTC Corporation |
| Lui Poh Ching | 5735 | Civil | 2025-02-27 | KKT Consultants Pte. Ltd. |
| Luk Kwan Hao | 3937 | Mechanical | 2004-12-03 | - |
| Lum Chong Chuen | 1197 | Electrical | 1976-05-18 | LAC Engineers & Associates |
| Lum Kok Mun | 4376 | Civil | 2010-11-18 | JTC Corporation |
| Lum Shuet Meng | 0799 | Mechanical | 1973-11-20 | SM Engineering Services |
| Lum Thim Kuai | 4214 | Electrical | 2007-05-17 | TUV SUD A-Reliance Pte. Ltd. |
| Lum Weng Fei James | 5115 | Civil | 2018-07-19 | Housing & Development Board |
| Lum Yun Kheun | 3732 | Mechanical | 2002-07-10 | YKLUM Pte. Ltd. |
| Lung Hian Hao @ Lung Tien Hao | 3665 | Civil | 2001-10-16 | Building and Construction Authority |
| Luo Farong | 5292 | Civil | 2019-12-05 | Building and Construction Authority |
| Luo Xiangyue | 4400 | Civil | 2011-07-22 | Arup Singapore Private Limited |
| Ly Paul | 1738 | Mechanical | 1982-03-05 | HPX Consulting Engineers Pte. Ltd. |
| Lye Kuan Loy | 2535 | Civil | 1990-01-23 | KLPT Consultants Pte Ltd |
| Ma Biao | 5623 | Electrical | 2024-03-28 | SP PowerGrid Limited |