| Name | College | Chapter | Registered Specialty | |
|---|---|---|---|---|
| Siti Rozana Binti Abdul Haziz | College of Radiologists | Chapter of Diagnostic Radiologists | Diagnostic Radiology | |
| Sitoh Yih Yian | College of Radiologists | Chapter of Diagnostic Radiologists | Diagnostic Radiology | |
| Sitoh Yih Yiow | College of Physicians | Chapter of Geriatricians, Chapter of Sleep Medicine Physicians | Geriatric Medicine | |
| Sittampalam Kesavan | Chapter of Pathologists | Pathology | ||
| Sittampalam, Krishnamoorthy | College of Surgeons | Chapter of Orthopaedic Surgeons | Orthopaedic Surgery | |
| Siu Wing Yin Vivian | College of Emergency Physicians | Section of Geriatric Emergency Medicine | Emergency Medicine | |
| Sivananthan Sivahami Saraswathi | College of Obstetricians and Gynaecologists | Obstetrics & Gynaecology | ||
| Sivaraman Pary | College of Physicians | Chapter of Renal Physicians | Renal Medicine | |
| Sivasakthi Velayuthapillai | ||||
| Richard Alan Smallwood | ||||
| Jar Smith | ||||
| S Nachammai Vidhya | College of Physicians | Chapter of Geriatricians | Geriatric Medicine | |
| Sng Soo Pheow | College of Obstetricians and Gynaecologists | Obstetrics & Gynaecology | ||
| Sng Kevin Kaity | College of Surgeons | Chapter of General Surgeons, Section of Colorectal Surgery | General Surgery | |
| Sng Hong Cheong Jeffrey | College of Dental Surgeons | Chapter of Prosthodontists | Prosthodontics | |
| Sng Li-Hwei | Chapter of Pathologists | Pathology | ||
| Sng Tsun Yee, Ivy | Chapter of Pathologists | Pathology | ||
| Sng Wei-Ee, Karen | College of Surgeons | Chapter of Plastic, Reconstructive and Aesthetic Surgeons | Plastic Surgery | |
| Sng Ban Leong | College of Anaesthesiologists | , Chapter of Pain Medicine Physicians | Anaesthesiology | |
| Sng Chelvin Cheryl Agnes | College of Ophthalmologists | Ophthalmology | ||
| Snodgrass Alison Marion | College of Paediatrics and Child Health | Paediatric Medicine | ||
| So Bok Yan | College of Surgeons | Chapter of General Surgeons | General Surgery | |
| So Kathleen | ||||
| Soh Rui Ya | College of Physicians | Chapter of Respiratory Physicians, Chapter of Sleep Medicine Physicians | Respiratory Medicine | |
| Soh Teck Hwee | College of Psychiatrists | Psychiatry |