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| Koh Yi Hong | 5424 | Civil | 2021-11-25 | ECAS Consultants Pte. Ltd. |
| Koh Yong Hong | 4537 | Civil | 2013-10-17 | Defence Science and Technology Agency |
| Koh Yong Huat Harry | 3300 | Civil | 1997-03-18 | HSK & Associates |
| Koh Yong Jing | 5729 | Electrical | 2025-02-27 | Defence Science and Technology Agency |
| Koh Ze Yee | 4880 | Civil | 2017-05-22 | Housing & Development Board |
| Koh Zhi Wei | 4649 | Civil | 2014-10-21 | JIB Specialist Consultants Pte. Ltd. |
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| Kok King Min @ Kok King Meng | 1596 | Civil | 1981-03-24 | PH Consulting Pte. Ltd. |
| Kok Tai Weng Andrew | 3590 | Civil | 2000-10-17 | Andrew Kok Engineers |
| Kong Decheng | 4796 | Civil | 2016-08-18 | Surbana Jurong Consultants Pte. Ltd. |
| Kong Jia Hng | 5108 | Mechanical | 2018-07-19 | Housing & Development Board |
| Kong Kam Cheong | 2366 | Civil | 1988-02-24 | KKC Consultancy Services |
| Kong Kian Hau | 5629 | Civil | 2024-03-28 | National University Of Singapore |
| Kong Kin Piew | 2059 | Electrical | 1984-06-29 | MyLittleWeb.Net |
| Kong Kok Khuen | 5926 | Civil | 2026-06-25 | Meinhardt (Singapore) Pte Ltd |
| Kong Ngie Ming | 1700 | Mechanical | 1981-10-27 | Tan Consultants |
| Kong Tze Foong | 4411 | Civil | 2011-09-23 | Building and Construction Authority |
| Kong Weng Hoong | 5259 | Civil | 2019-10-17 | WCT CONSULTANTS PTE LTD |
| Koo Chung Man | 3399 | Civil | 1998-05-19 | CMK Engineering Consultants Pte. Ltd. |
| Koo Shi Qi | 5487 | Civil | 2022-09-29 | Surbana Jurong Consultants Pte. Ltd. |
| Koo Zhen Xian Freddie | 4792 | Civil | 2016-07-21 | Surbana Jurong Consultants Pte. Ltd. |
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| Kow Chien Khuang | 5801 | Electrical | 2025-10-23 | SP Group |
| Kow Kah Hoe | 5087 | Civil | 2018-06-21 | GeoAlliance Consultants Pte. Ltd. |
| Kow Wee Kwang | 4862 | Mechanical | 2017-03-23 | DP Engineers Pte. Ltd. |
| Kresna Candra Widadi | 4434 | Electrical | 2012-02-16 | Shell Singapore Pte. Ltd. |
| Krishnan Murugappan | 3713 | Civil | 2002-06-21 | CKMbT International Pte. Ltd. |