| Ref No | Year | Description | Type | U.M. | F.U. | FDC |
|---|---|---|---|---|---|---|
| S21-1 | 2021 | Zodiac Series - Ox | 2v | 3.00 | 3.00 | 4.00 |
| S21-1P | 2021 | Zodiac Series - Ox | Mini-sheet | 9.00 | - | - |
| S21-1a | 2021 | Zodiac Series - Ox (1v) | self-adhesive | 1.00 | 1.00 | - |
| S21-1C | 2021 | Zodiac Series - Ox | Collector's sheet | 25.00 | - | - |
| S21-1M | 2021 | Reunion Series - Pen Cai | MS | 12.50 | - | 13.50 |
| S21-2 | 2021 | Hawker Culture | 4v | 5.00 | 5.00 | 6.00 |
| S21-3 | 2021 | Tetra Fish - High-value Definitives | 4v | 16.00 | 16.00 | 17.00 |
| S21-3CH | 2021 | Tetra Fish - High-value Definitives | Collector's sheet | 25.00 | - | - |
| S21-3CL | 2021 | Goldfishes - Low-value Definitives | Collector's sheet | 15.00 | - | - |
| S21-4 | 2021 | Singapore-Portugal Joint Issue | 2v | 4.00 | 4.00 | 5.00 |
| S21-4M | 2021 | Singapore-Portugal Joint Issue | MS | 4.50 | 4.50 | 5.50 |
| S21-5 | 2021 | 50th Anniversary of College of Family Physicians | 6v | 8.00 | 8.00 | 9.00 |
| S21-6 | 2021 | Skyrise Greenery | 6v | 7.00 | 7.00 | 8.00 |
| S21-7 | 2021 | Tokyo 2020 Olympic Games | 6v | 6.50 | 6.50 | 7.50 |
| S21-8 | 2021 | Singapore-Sri Lanka Joint Issue | 2v | 4.00 | 4.00 | 5.00 |
| S21-8M | 2021 | Singapore-Sri Lanka Joint Issue | MS | 4.50 | 4.50 | 5.50 |
| S21-9 | 2021 | 200 Years of Healthcare | 4v | 5.00 | 5.00 | 5.50 |
| S21-10 | 2021 | COVID-19 Series II - A Tribute to Frontliners | 10v | 10.00 | 10.00 | 11.00 |
| S21-10M | 2021 | COVID-19 Series II - A Tribute to Frontliners | MS | 3.00 | 3.00 | 4.00 |
| S21-11 | 2021 | Greetings | 10v | 8.50 | 8.50 | 10.50 |
| S21-12 | 2021 | Heritage Collection | CS | 30.00 | - | - |
| S21-13 | 2021 | 50th Anniversary of Five Power Defence Arrangement (FPDA) | 4v | 5.00 | 5.00 | 6.00 |
| S21-14 | 2021 | Celebrating SG Women | 1v | 2.50 | 2.50 | 3.50 |
| S21-15 | 2021 | 75th Anniversary of the Singapore Prison Services | 4v | 5.00 | 5.00 | 6.00 |
| S21-16 | 2021 | 50th Anniversary of the Central Narcotics Bureau | 3v | 4.00 | 4.00 | 5.00 |