| Sankar Navasivayam | 5606 | Civil | 2024-01-25 | Mott MacDonald Singapore Pte Limited |
| Santoso Lukito | 5133 | Civil | 2018-08-16 | Building and Construction Authority |
| Saravanapavan Athavan | 5573 | Civil | 2023-07-27 | OCTA Consultants Pte. Ltd. |
| Satishkumar s/o Kurusamy | 4702 | Mechanical | 2015-08-18 | SK Inspection Pte. Ltd. |
| Saynie Lim Say Nie | 5891 | Civil | 2026-05-28 | Building and Construction Authority |
| Scott Andrew Munro | 4490 | Mechanical | 2012-10-16 | Arup Singapore Private Limited |
| Seah Boon Chuan | 0399 | Electrical | 1972-04-26 | - |
| Seah Chia Kwee | 3715 | Mechanical | 2002-06-21 | SCKSJH |
| Sebastian Lee Tzyy Tong | 4610 | Civil | 2014-06-23 | Arup Singapore Private Limited |
| See King Chai | 2872 | Electrical | 1992-10-21 | - |
| See Kok Leng | 5415 | Electrical | 2021-07-21 | Chevalier Singapore Holdings Pte. Ltd. |
| See Lin Ming | 3430 | Civil | 1998-09-15 | Arup Singapore Private Limited |
| See Mee Hoo | 2509 | Electrical | 1989-09-20 | PUB, Singapore's National Water Agency |
| See Shiau Ling | 5725 | Civil | 2025-01-23 | Building and Construction Authority |
| Seet Kwang Min | 5919 | Mechanical | 2026-06-25 | Icon Engineers LLP |
| Seh Chong Peng | 1829 | Civil | 1982-09-14 | Kiso-Jiban Singapore Pte Ltd |
| Selvarajah Selvachandran | 5811 | Civil | 2025-10-23 | JTC Corporation |
| Seng Sioh Ngee | 3122 | Mechanical | 1995-04-13 | Sembcorp Architects & Engineers Pte. Ltd. |
| Senthilnathan Mathyalakan | 5828 | Civil | 2026-01-22 | Infra Tech Professionals Pte. Ltd. |
| Seo Bee Lian | 4628 | Civil | 2014-09-18 | Land Transport Authority |
| Seow Foo Meng | 2207 | Mechanical | 1985-11-07 | FM Engineering Services |
| Seow Joo Heng | 3688 | Electrical | 2002-03-19 | Surbana Jurong Consultants Pte. Ltd. |
| Seow Kang Seng | 1659 | Electrical | 1981-07-31 | - |
| Seow Teck Pang | 2947 | Civil | 1993-08-18 | TP Seow Consultants |
| Seow Zhi Wei | 4526 | Electrical | 2013-08-23 | Mediacorp |
| Seow Zhi Yi | 5900 | Civil | 2026-05-28 | Land Transport Authority (LTA) |
| Set Zhi Wei | 5447 | Electrical | 2022-01-27 | SP Group |
| Sethunarayanan Sethunarayanan | 1800 | | 1982-08-16 | - |
| Sha Lin | 5562 | Electrical | 2023-06-22 | National University Health System |
| Shahrom Bin Mohamed Ariff | 3733 | Mechanical | 2002-07-10 | Rankine & Hill (Singapore) Pte. Ltd. |