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| Yan Chong Hui | 4795 | Civil | 2016-07-21 | Building and Construction Authority |
| Yan Jintang | 4395 | Civil | 2011-05-19 | AECOM Singapore Pte. Ltd. |
| Yang Dexi | 5621 | Civil | 2024-02-22 | Waytech Engineering Consultants Pte. Ltd. |
| Yang Haibo | 4708 | Civil | 2015-08-18 | Sentosa Development Corporation |
| Yang Lin | 5469 | Electrical | 2022-06-23 | SP PowerGrid Limited |
| Yang Mingcai | 4322 | Civil | 2009-08-20 | SSD Engineering Pte Ltd |
| Yang Yi Qin Christopher | 1534 | Electrical | 1981-02-17 | Arup Singapore Private Limited |
| Yao Hongbing | 4425 | Civil | 2012-02-16 | KTP Consultants Pte Ltd |
| Yap Boon Leong | 3592 | Civil | 2000-10-17 | Land Transport Authority |
| Yap Chern Lim Kenneth | 5466 | Civil | 2022-06-23 | Woh Hup (Private) Limited |
| Yap Choon Hong June | 3581 | Civil | 2000-08-15 | JYC Consultancy Pte. Ltd. |
| Yap Choon Siong | 4736 | Mechanical | 2015-12-04 | YXH Engineers LLP |
| Yap Chuen Meng | 3804 | Mechanical | 2003-04-15 | WSP Consultancy Pte. Ltd. |
| Yap Guat Cheng | 3365 | Civil | 1997-09-16 | - |
| Yap Ken Kuo | 4297 | Civil | 2009-03-19 | Alan Yap Engineers & Associates Pte. Ltd. |
| Yap Kok Cheong | 2291 | Civil | 1986-11-20 | Keyes Consultants |
| Yap Kwong Ling | 3320 | Civil | 1997-05-20 | K L Yap Consultants |
| Yap Leelyn Lee Yu | 4594 | Civil | 2014-04-17 | KK Lim & Associates Pte. Ltd. |
| Yap Miin Kai | 5783 | Civil | 2025-07-24 | YWL Engineering Pte Ltd |
| Yap Mui Cheng Serena | 4052 | Civil | 2006-05-16 | Taylor Thomson Whitting (SG) Pte. Ltd. |
| Yap Shih Lim | 5091 | Civil | 2018-06-21 | A-Terra Consultants Pte. Ltd. |
| Yap So Yeong | 4817 | Electrical | 2016-10-18 | SWTS Consulting Engineers Pte. Ltd. |
| Yap Soo Heng | 2554 | Civil | 1990-04-18 | Uni-Associated Consultants Pte. Ltd. |
| Yap Tee Hean | 3855 | Mechanical | 2003-10-28 | Activa Engineers |
| Yap Tiem Yew | 2164 | Civil | 1985-07-19 | TY Yap Consultancy |
| Yap Ting Ting Eileen | 5324 | Civil | 2020-04-16 | RSP Architects Planners & Engineers (Pte) Ltd |
| Yap Voon Sing | 4261 | Electrical | 2007-07-19 | SP PowerGrid Limited |
| Yarp Sue Ann | 5162 | Civil | 2018-10-18 | Building and Construction Authority |
| Yau Kwok Yeung | 1618 | Civil | 1981-03-24 | YKY Engineering Consultants Pte Ltd |