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| You Fook Hin | 3292 | Civil | 1996-11-19 | Mott MacDonald Singapore Pte Limited |
| Yow Cheong Hoe | 4036 | Civil | 2006-05-16 | Chye Joo Construction Pte Ltd |
| Yu Chin Ga @ Yu Chin Chee | 1549 | Electrical | 1981-03-24 | Regional Engineering Pte. Ltd. |
| Yu Chou Young | 4378 | Mechanical | 2010-11-18 | Regional Engineering Pte. Ltd. |
| Yu Guohua | 5548 | Electrical | 2023-05-18 | SMRT TEL Pte Ltd |
| Yu Keng Liang | 5538 | Electrical | 2023-04-27 | SP PowerGrid Limited |
| Yu Tong Lea | 2438 | Civil | 1989-01-11 | HSL Ground Engineering Pte. Ltd. |
| Yu Weijiang | 4405 | Mechanical | 2011-09-23 | Keppel |
| Yu Xian Liang | 5613 | Civil | 2024-01-25 | YXL Engineering Consultant |
| Yu Yang | 4898 | Civil | 2017-07-18 | - |
| Yu Yong Hua | 4282 | Civil | 2008-01-17 | ECAS Consultants Pte. Ltd. |
| Yuan Junhong | 5870 | Mechanical | 2026-03-26 | I.EM Engineering Consultants Pte. Ltd. |
| Yuan Shanhua | 5760 | Civil | 2025-04-17 | KCL Consultants Pte. Ltd. |
| Yuan Yuxun | 4975 | Chemical | 2017-10-23 | Surbana Jurong Infrastructure Pte. Ltd. |
| Yuan Zhen | 4324 | Civil | 2009-09-17 | AECOM Singapore Pte. Ltd. |
| Yulius Halim Gunawan | 5159 | Civil | 2018-10-18 | CPG Consultants Pte Ltd |
| Zhang Bin | 4573 | Civil | 2014-01-16 | Land Transport Authority |
| Zhang Heliang | 4648 | Electrical | 2014-10-21 | Mott MacDonald Singapore Pte Limited |
| Zhang Jielin | 5718 | Electrical | 2024-10-24 | Belmacs Pte Ltd |
| Zhang Lin Dong | 5543 | Mechanical | 2023-05-18 | Microsoft Operations Pte Ltd |
| Zhang Liping | 4646 | Civil | 2014-10-21 | Precast Concrete Pte Ltd |
| Zhang Lizhong | 4352 | Electrical | 2010-05-20 | YJME Engineering Pte. Ltd. |
| Zhang Ning | 4502 | Civil | 2013-02-18 | AECOM Singapore Pte. Ltd. |
| Zhang Qi | 5239 | Civil | 2019-07-18 | Surbana Jurong Consultants Pte. Ltd. |
| Zhang Qingyu | 4285 | Civil | 2008-05-15 | DP Architects Pte Ltd. |
| Zhang Xiuting | 5527 | Mechanical | 2023-03-23 | Changi Airport Group (Singapore) Pte Ltd |
| Zhang Xu | 4371 | Civil | 2010-09-17 | WSP Consultancy Pte. Ltd. |
| Zhang Xu Dong | 4263 | Mechanical | 2007-07-19 | AECOM Singapore Pte. Ltd. |
| Zhang Yang | 5559 | Civil | 2023-06-22 | - |