| Name | College | Chapter | Registered Specialty | |
|---|---|---|---|---|
| Sia Si Min Charmaine | College of Physicians | Chapter of Renal Physicians | Renal Medicine | |
| Sia Wei Tee | College of Surgeons | Chapter of Hand Surgeons | Hand Surgery | |
| Siah Tien Ho | College of Physicians | Chapter of Gastroenterologists | Gastroenterology | |
| Siak Jyh Kuen Jay | College of Ophthalmologists | Ophthalmology | ||
| Siak Chong Leng | College of Paediatrics and Child Health | Paediatric Medicine | ||
| Siantar Rosalynn Grace | College of Ophthalmologists | Ophthalmology | ||
| Siaw Tung Yeng | Chapter of Family Medicine Physicians | Family Medicine | ||
| Siddiqui Mohd Mashfiqul Arafin | College of Surgeons | Chapter of Orthopaedic Surgeons | Orthopaedic Surgery | |
| Sidhu Harvinder Raj Singh | College of Surgeons | Chapter of General Surgeons | General Surgery | |
| Nicole Sie Ming | College of Ophthalmologists | Ophthalmology | ||
| Sieow Yu-Fang Nicole | College of Physicians | Chapter of Respiratory Physicians, Chapter of Intensivists | Respiratory Medicine, Intensive Care Medicine | |
| Siew Ka Fai Stephen | College of Surgeons | Chapter of Hand Surgeons | Hand Surgery | |
| Siew Hin Chin | College of Psychiatrists | Psychiatry | ||
| Si Hoe Kok Chun | College of Anaesthesiologists | Anaesthesiology | ||
| Si-Hoe Cheng Kit | College of Radiologists | Chapter of Diagnostic Radiologists | Diagnostic Radiology | |
| Si-Hoe Kok Soon | College of Dental Surgeons | Chapter of Periodontists | Periodontics | |
| Sim Ling Hui Brenda | College of Surgeons | Chapter of Otorhinolaryngologists | Otorhinolaryngology | |
| Sim Khung Peng Shaun Sebastian | College of Ophthalmologists | Ophthalmology | ||
| Sim Tiong Peng | College of Emergency Physicians | Emergency Medicine | ||
| Sim Song Teck, Roland | College of Surgeons | Chapter of Otorhinolaryngologists, Section of Facial Plastic and Reconstructive Surgery | Otorhinolaryngology | |
| Sim Wee Kiat | College of Dental Surgeons | Chapter of Orthodontists | Orthodontics | |
| Sim Kah Ming | College of Anaesthesiologists | Chapter of Intensivists | Anaesthesiology, Intensive Care Medicine | |
| Sim Han Jen, Daniel | College of Ophthalmologists | Ophthalmology | ||
| Sim Siam Wee | College of Surgeons | Chapter of Paediatric Surgeons | Paediatric Surgery | |
| Sim Ming Ann | College of Anaesthesiologists | Anaesthesiology |