| Lee Jian Wei | 5539 | Electrical | 2023-04-27 | ON Engineers Pte. Ltd. |
| Lee Jie Yin Jaclyn | 4864 | Mechanical | 2017-03-23 | MEPLOGIC ENGINEERING CONSULTANTS PTE. LTD. |
| Lee Jing Yang | 5290 | Civil | 2019-12-05 | Jansen SC International Pte Ltd |
| Lee Ka Wing | 3414 | Civil | 1998-06-23 | KW & Lee Consulting Engineers Pte. Ltd. |
| Lee Kah Chan | 3061 | Civil | 1994-09-21 | Geoconsult Asia Singapore Pte Ltd |
| Lee Keng Fai | 3369 | Electrical | 1997-10-21 | SP Group |
| Lee Keng Seng | 5653 | Civil | 2024-06-27 | KTP Consultants Pte Ltd |
| Lee Keng Yong Staniel | 5327 | Mechanical | 2020-08-20 | Defence Science and Technology Agency |
| Lee Khee Siong | 4073 | Electrical | 2006-09-19 | Raiden J'merz Er.Liance |
| Lee Khim Chong | 3402 | Civil | 1998-05-19 | KKT Consultants Pte. Ltd. |
| Lee Kian Chew Thomas | 2981 | Electrical | 1994-01-19 | TL Consultancy Services Pte Ltd |
| Lee Kiang Hock | 1944 | Civil | 1983-07-26 | Mega Consult |
| Lee Kwek Chong | 2648 | Civil | 1991-04-17 | K.C. Lee Associates |
| Lee Leong How | 4031 | Civil | 2006-04-18 | Surbana Jurong Consultants Pte. Ltd. |
| Lee Leong Wah | 4290 | Civil | 2008-09-18 | MODEC Offshore Production Systems / Offshore Frontier Solutions |
| Lee Leong Ying | 1239 | Mechanical | 1976-12-21 | Rilly Pte Ltd |
| Lee Liang Cen | 5484 | Civil | 2022-09-29 | KTP Consultants Pte Ltd |
| Lee Mee Nee | 5354 | Civil | 2020-10-15 | JTC Corporation |
| Lee Ming Zhen | 5664 | Electrical | 2024-06-27 | SP PowerGrid Limited |
| Lee Nang Sin | 3229 | Mechanical | 1996-06-14 | L&L Engineering Consultant |
| Lee Ngai Hung | 3626 | Electrical | 2001-05-11 | Changi Airport Group (Singapore) Pte. Ltd. |
| Lee Ping Hui | 3803 | Electrical | 2003-04-15 | CLT Management Pte Ltd |
| Lee Poh Choo | 1739 | Electrical | 1982-03-05 | Carlo Solutions |
| Lee Pueh Yong | 3480 | Civil | 1999-06-15 | CSCE Pte. Ltd. |
| Lee Say Teck | 4362 | Electrical | 2010-07-16 | SP Group |
| Lee Sea Huey | 3460 | Electrical | 1999-04-20 | SP PowerGrid Limited |
| Lee See Loi | 2455 | Mechanical | 1989-03-22 | Lee S L Engineering Enterprise |
| Lee Seng How | 4485 | Electrical | 2012-10-16 | A2CTS LLP |
| Lee Seng Kee | 2040 | Civil | 1984-02-28 | C&W Services (S) Pte Ltd |
| Lee Seng Koon | 4235 | Civil | 2007-06-14 | SJD Consultants Pte. Ltd. |