| Khoo Ean Lay | 3488 | Electrical | 1999-07-20 | - |
| Khoo Jie Sheng | 5666 | Electrical | 2024-07-26 | Mapletree Investments |
| Khoo Kay Hoo | 5754 | Electrical | 2025-03-27 | Gims & Associates Pte. Ltd. |
| Khoo Kay Leng | 1394 | Electrical | 1979-12-08 | PUB, Singapore's National Water Agency |
| Khoo Kent Loong | 5691 | Mechanical | 2024-08-23 | Housing & Development Board |
| Khoo Kok Sing | 3220 | Civil | 1996-05-08 | KTP Consultants Pte Ltd |
| Khoo Lin Inn | 4479 | Civil | 2012-10-16 | Changi Airport Group |
| Khoo Meng Heong | 5456 | Electrical | 2022-04-28 | SMRT Trains Ltd |
| Khoo Rongwen | 4920 | Civil | 2017-08-22 | People's Association |
| Khoo Shin Dih | 5243 | Civil | 2019-07-18 | Surbana Jurong Consultants Pte Ltd |
| Khoo Teng Hai | 3608 | Civil | 2001-01-16 | GNG Consultants Pte. Ltd. |
| Khoo Teng Peng | 3728 | Civil | 2002-06-21 | Defence Science and Technology Agency |
| Khoo Vui Keeng | 4075 | Electrical | 2006-09-19 | Icon Engineers LLP |
| Khoo Way Hung | 5802 | Electrical | 2025-10-23 | Bescon Consulting Engineers Pte |
| Khoo Wen Jia | 5454 | Mechanical | 2022-03-24 | TUV SUD A-Reliance Pte. Ltd. |
| Khoo Yih Perng | 5624 | Mechanical | 2024-03-28 | TUV SUD PSB Pte Ltd |
| Khor Bee Khoon | 5363 | Mechanical | 2020-11-19 | Alpha Consulting Engineers Pte Ltd |
| Khor Ten Chun Alan | 5668 | Electrical | 2024-07-26 | Skye Renewables Energy Pte. Ltd. |
| Khuan Bok Chuan | 5164 | Mechanical | 2018-10-18 | DP Engineers Pte. Ltd. |
| Kiew Kwong Ping | 4535 | Civil | 2013-10-17 | - |
| Kim Do Sik | 5482 | Civil | 2022-09-29 | Geoconsult Asia Singapore Pte Ltd |
| Kim Jin Ha | 5798 | Civil | 2025-09-05 | KTP Consultants Pte Ltd |
| Kng Meng Hwee | 2736 | Electrical | 1991-11-20 | - |
| Ko Luan Bock | 3168 | Civil | 1995-09-20 | KSK Consultants |
| Koa Beng Ser | 2526 | Mechanical | 1990-01-23 | KBS Engineering Services |
| Koay Hean Lye Kelvin | 1563 | Mechanical | 1981-03-24 | Koays Consulting Pte Ltd |
| Kog Yue Choong | 1432 | Civil | 1979-12-08 | East West Engineering Consultants |
| Koh Bee Choo Christina | 4172 | Civil | 2007-03-15 | Beca Carter Hollings & Ferner (S.E.Asia) Pte Ltd |
| Koh Beng Thong | 2512 | Civil | 1989-10-18 | - |
| Koh Bock Cheng | 1595 | Civil | 1981-03-24 | BCK & Partners Pte. Ltd. |