| Lee Yeong | 3899 | Civil | 2004-06-22 | Landmark Consultant Pte. Ltd. |
| Lee Yeow Boon | 4914 | Electrical | 2017-08-22 | Defence Science and Technology Agency |
| Lee Yi Ming | 5895 | Electrical | 2026-05-28 | Arup Singapore Private Limited |
| Lee Yin Hoe | 3162 | Civil | 1995-08-16 | - |
| Lee Yong Ta | 5350 | Electrical | 2020-10-15 | Sp Group |
| Lee Yuen Hoah | 3170 | Civil | 1995-09-20 | CSG Consulting Engineers |
| Lee Yuh Fang | 4446 | Civil | 2012-05-17 | BCA Academy Of The Built Environment |
| Lee Zi Du | 3509 | Civil | 1999-09-21 | WSP Consultancy Pte. Ltd. |
| Leen Kar Weng | 5429 | Electrical | 2021-11-25 | RES Engineering Services |
| Lei Yuhao | 5716 | Civil | 2024-10-24 | Beca Carter Hollings & Ferner (S.E.Asia) Pte Ltd |
| Lein Shiuh Yee | 5455 | Electrical | 2022-04-28 | Land Transport Authority |
| Lek Hwee Chong | 4076 | Electrical | 2006-09-19 | Seatrium (SG) Pte. Ltd. |
| Lek Siang Hwa | 3194 | Mechanical | 1996-01-18 | SJD Consultants Pte. Ltd. |
| Leng Cai Ling | 4860 | Civil | 2017-03-23 | Surbana Consultants Pte. Ltd. |
| Leng Chun Hong | 4787 | Electrical | 2016-06-16 | Housing & Development Board |
| Leng Kwek Min | 2885 | Civil | 1992-12-16 | Leng Consultants |
| Leng Meng Kae | 3538 | Electrical | 2000-04-18 | EDC Engineers |
| Leo Adidharma | 5844 | Civil | 2026-02-26 | ENGINEERS 9000 PTE LTD |
| Leo Ding Yuen | 4118 | Electrical | 2007-01-26 | SP PowerGrid Limited |
| Leo Meng Foo | 2418 | Mechanical | 1988-09-27 | - |
| Leong Bo Siang | 5830 | Civil | 2026-01-22 | Building And Construction Authority (BCA) |
| Leong Boon Cheng | 3062 | Civil | 1994-09-21 | ECAS Consultants Pte. Ltd. |
| Leong Cheng Wee | 3833 | Mechanical | 2003-08-16 | Leong CW & Associates Pte. Ltd. |
| Leong Chin Yong | 2048 | Mechanical | 1984-04-04 | LCY Consulting Engineer |
| Leong Choi Mui | 4206 | Civil | 2007-05-17 | Leng Consultants |
| Leong Eng Choon | 3839 | Civil | 2003-09-16 | Nanyang Technological University |
| Leong Hu Kit David | 1677 | Civil | 1981-08-28 | Engineering Design Partnership |
| Leong Khai Weng | 4085 | Mechanical | 2006-10-17 | EWC Engineers Pte. Ltd. |
| Leong Kit Meng | 3812 | Civil | 2003-05-20 | LeongKM Engineers |
| Leong Kok Sang | 4531 | Civil | 2013-08-23 | T.Y.Lin International Pte. Ltd. |