| Steve Sim Kar Kiat | 5172 | Mechanical | 2018-10-18 | PDC Consultants Pte. Ltd. |
| Su Lifeng | 4662 | Civil | 2015-02-13 | SJ Group |
| Su Yen Bing | 5861 | Chemical | 2026-03-26 | ST Engineering |
| Su Yu Hai | 1605 | Civil | 1981-03-24 | Macrobuild Consultants |
| Subbaiyan Mahatma | 3917 | Civil | 2004-08-13 | IC Singapore Pte. Ltd. |
| Sudiono @ Su Zhuang Wei | 4133 | Electrical | 2007-02-23 | Mandai Park Development Pte. Ltd. |
| Sum Jiahui Derek | 5481 | Electrical | 2022-08-25 | ByteDance Pte. Ltd. |
| Sun Jianping | 5343 | Civil | 2020-10-15 | CHECC(Singapore) Pte. Ltd. |
| Sun Jie | 5531 | Civil | 2023-04-27 | Building And Construction Authority (BCA) |
| Sun Jinhui | 4962 | Civil | 2017-10-23 | Civil Geo Tech Consultants |
| Sun Qingguo | 4410 | Civil | 2011-09-23 | KTP Consultants Pte Ltd |
| Sun Shijun | 4848 | Civil | 2017-02-16 | R.J. Crocker Consultants Pte. Ltd. |
| Sunendro Aris Sutanto Himawan | 4961 | Civil | 2017-10-23 | Arup Singapore Private Limited |
| Surya Kusuma | 5304 | Civil | 2020-01-16 | H&T Consulting Engineers Pte. Ltd. |
| Sutomo Salim | 5274 | Civil | 2019-10-17 | Housing & Development Board |
| Swee Jenny | 3583 | Mechanical | 2000-09-19 | - |
| Sye Toh Siang Lin | 4274 | Electrical | 2007-11-15 | Housing & Development Board |
| Sze Chi Young | 2582 | Civil | 1990-08-15 | Development Engineering Consultants |
| Sze Hock Thong | 3239 | Civil | 1996-06-14 | HT Engineering Consultant |
| Tai Chin Hoe | 4586 | Mechanical | 2014-03-20 | C2D Solutions Pte. Ltd. |
| Tai Lee Keat Richard | 3758 | Civil | 2002-09-12 | Arup Singapore Private Limited |
| Tai Seng Chong | 3031 | Mechanical | 1994-05-18 | TJF Consultants |
| Tai Siew Neo | 3296 | Civil | 1997-02-18 | TSN Engineering Consultants |
| Tai Tan Yin | 2551 | Civil | 1990-03-21 | T H Chuah & Partners LLP |
| Tam Chee Chuen | 3968 | Mechanical | 2005-05-20 | Surbana Jurong Consultants Pte. Ltd. |
| Tam Chun Wah | 4585 | Mechanical | 2014-03-20 | TCW Consultant |
| Tam Kai Heng | 2898 | Electrical | 1993-01-20 | - |
| Tan Ah Chye | 1085 | Mechanical | 1975-05-09 | Zentar Marine Pte Ltd |
| Tan Ah Eng | 4234 | Civil | 2007-06-14 | Housing & Development Board |
| Tan Ah Sam | 1335 | Electrical | 1978-04-18 | Civic Lion Engineering Pte Ltd. |