| v 48 | 1 十二月 | | | | | | | | | |
| 2 十二月 | | | | | | | | | |
| 3 十二月 | | | | | | | | | |
| 4 十二月 | 公園定向同樂日(香港動植物公園) Park Orienteering Fun Day (Hong Kong Zoological and Botanical Gardens) |  Leisure and Cultural Services Department
 Orienteering Association of Hong Kong, China | Hong Kong | | loc | | S | | |
| Str8 x TerraX Sprint Orienteering Tournament 2021 Round 6 |  TerraX Sports Club
 Y2Y Orienteering Development and Training Centre | Hong Kong | | loc | | S | |  |
| 5 十二月 | 公園定向同樂日(香港動植物公園) Park Orienteering Fun Day (Hong Kong Zoological and Botanical Gardens) | Leisure and Cultural Services Department
Orienteering Association of Hong Kong, China | Hong Kong | | loc | | S | | |
| Pro-Active 短距離系列賽 2021 總決賽 Pro-Active Sprint Orienteering 2021 Final |  Pro-Active Orienteering Club | Hong Kong | | loc | | S | | |
| v 49 | 6 十二月 | | | | | | | | | |
| 7 十二月 | | | | | | | | | |
| 8 十二月 | | | | | | | | | |
| 9 十二月 | | | | | | | | | |
| 10 十二月 | | | | | | | | | |
| 11 十二月 | | | | | | | | | |
| 12 十二月 | 香港定向排名聯賽 – 中/長距離(鴨仔山) Hong Kong Orienteering Ranking League - Middle/Long(Duckling Hill) | Orienteering Association of Hong Kong, China | Hong Kong | | loc | | M | | |
| v 50 | 13 十二月 | | | | | | | | | |
| 14 十二月 | | | | | | | | | |
| 15 十二月 | | | | | | | | | |
| 16 十二月 | | | | | | | | | |
| 17 十二月 | | | | | | | | | |
| 18 十二月 | 2021香港周年沿徑定向錦標賽(精確賽)暨世界排位賽 (長洲西園) Hong Kong Annual Trail Orienteering Championships 2021 (PreO) Cum World Ranking Event (Saiyuen Cheung Chau) |  MOPC
Orienteering Association of Hong Kong, China | Hong Kong | T | loc | | P | | |
| 19 十二月 | 2021 香港周年沿徑定向錦標賽 (速決賽) 暨世界排位賽 (保良局賽馬會大棠渡假村) Hong Kong Annual Trail Orienteering Championships 2021 (TempO) Cum World Ranking Event (PLK JC Tai Tong Holiday Camp) | Orienteering Association of Hong Kong, China
 Startrail Orienteering Club | Hong Kong | T | loc | | T | | |
| v 51 | 20 十二月 | | | | | | | | | |
| 21 十二月 | | | | | | | | | |
| 22 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 |  Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| 23 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| 24 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| 25 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| X'Mas Orienteering Challenge Series 2021, race 1 | Y2Y Orienteering Development and Training Centre | Hong Kong | | loc | | S | | |
| 26 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| X'Mas Orienteering Challenge Series 2021, race 2 | Y2Y Orienteering Development and Training Centre | Hong Kong | | loc | | M | | |
| 香港定向排名聯賽 – 中/長距離 (下花山) Hong Kong Orienteering Ranking League - Middle/Long (Ha Fa Shan) | Orienteering Association of Hong Kong, China | Hong Kong | | loc | | M | | |
| v 52 | 27 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| X'Mas Orienteering Challenge Series 2021, race 3 | Y2Y Orienteering Development and Training Centre | Hong Kong | | loc | | L | | |
| 香港定向排名聯賽 – 短距離(馬灣) Hong Kong Orienteering Ranking League - Sprint (Ma Wan) |  Metropolitan Orienteering Club
Orienteering Association of Hong Kong, China | Hong Kong | | loc | | S | | |
| 28 十二月 | 2021年 香港野外定向會 x 台灣定向運動協會 網上沿徑定向（精確賽）系列 第六回 HKOC x TWOA Online TrailO (PreO) Series 2021 Series 6 | Hong Kong Orienteering Club | Hong Kong | T | loc | | P | | |
| 29 十二月 | | | | | | | | | |
| 30 十二月 | | | | | | | | | |
| 31 十二月 | AASR-00 |  Apex Action | Hong Kong | | loc | | S | | |
