| Lee Seng Wee | 3956 | Electrical | 2005-04-19 | Ramboll Pte. Ltd. |
| Lee Shih Hui | 5742 | Mechanical | 2025-03-27 | - |
| Lee Si Min | 5328 | Mechanical | 2020-08-20 | Building and Construction Authority |
| Lee Siew Beng | 4398 | Civil | 2011-07-22 | T.Y.Lin International Pte. Ltd. |
| Lee Siew Kee | 3195 | Mechanical | 1996-01-18 | SGSPE Pte. Ltd. |
| Lee Siow Hoon | 4525 | Electrical | 2013-08-23 | - |
| Lee Sok Fun | 3724 | Civil | 2002-06-21 | - |
| Lee Soo Hui Winson | 4444 | Mechanical | 2012-05-17 | WL Engineering Consultancy Pte. Ltd. |
| Lee Soon Ghee | 1598 | Civil | 1981-03-24 | MSE Consultants Pte. Ltd. |
| Lee Soon On | 4084 | Mechanical | 2006-10-17 | JESPLAN Consultants |
| Lee Swee Choy | 2737 | Electrical | 1991-11-20 | SC & Associates |
| Lee Swee Hong | 3110 | Civil | 1995-03-15 | Fong Consult Pte. Ltd. |
| Lee Tak Meng | 2838 | Civil | 1992-07-15 | Gransford LL LLP |
| Lee Tat Sang | 1936 | Civil | 1983-07-27 | T S Lee Civil Structural Associates |
| Lee Teng Kiat | 1189 | Civil | 1976-05-18 | T K Lee Consulting Engineers |
| Lee Teng Pong | 3515 | Electrical | 1999-10-19 | Bescon Consulting Engineers Pte |
| Lee Tieng Wei | 4837 | Electrical | 2016-10-18 | Energy Market Authority |
| Lee Tuck Cheong | 3139 | Civil | 1995-05-17 | Surbana Jurong Consultants Pte. Ltd. |
| Lee Veng Yan | 4664 | Civil | 2015-02-13 | VYL Consultings |
| Lee Wai Leong | 4009 | Mechanical | 2005-09-20 | CCA & Partners Pte. Ltd. |
| Lee Wai Meng | 2992 | Electrical | 1994-03-16 | ON Engineers Pte. Ltd. |
| Lee Wai Wah | 3881 | Mechanical | 2004-05-05 | Deluge Offshore & Marine Pte. Ltd. |
| Lee Wee Hing | 4433 | Electrical | 2012-02-16 | Elead Associates Pte. Ltd. |
| Lee Wee Shin | 3008 | Mechanical | 1994-05-18 | Housing & Development Board |
| Lee Wee Tiong | 5542 | Mechanical | 2023-05-18 | Amazon Asia-Pacific Resources Private Limited |
| Lee Wei Xian | 5002 | Electrical | 2018-01-08 | Changi Airport Group (Singapore) Pte. Ltd. |
| Lee Xuan Yen | 5289 | Civil | 2019-12-05 | Building and Construction Authority |
| Lee Yee Seng | 4345 | Civil | 2010-03-18 | KCL Consultants Pte. Ltd. |
| Lee Yen Fong | 3264 | Civil | 1996-08-07 | T H Chuah & Partners LLP |
| Lee Yen Hau Melvin | 4679 | Mechanical | 2015-05-19 | Beca Carter Hollings & Ferner (S.E.Asia) Pte Ltd |