| Rnd | Date | Age Group | Home Club Name | Away Club Name | Ground | ||
| Tuesday 18 May | |||||||
| 5 | 18.05.2021 | W-Under 13/2 | Harbord FC | 1 | 0 | BTH Raiders SC A | Harbord Park 1 |
| Friday 21 May | |||||||
| 7 | 2021-05-21 | Under 21/1 | Harbord FC A | 2 | 1 | Wakehurst FC B | Millers 1 |
| 7 | 2021-05-21 | Under 21/1 | CC Strikers FC | 1 | 7 | Harbord FC B | St Matthews Farm 3 |
| 7 | 2021-05-21 | AL8 | Mosman FC | 3 | 2 | Harbord FC | Seaforth Oval 2 |
| Saturday 22 May | |||||||
| 6 | 2021-05-22 | Under 8 | Harbord FC Rockets | 0 | 1 | Harbord FC Dynamites | Nolans J8/9A |
| 6 | 2021-05-22 | Under 8 | Harbord FC Comets | 1 | 3 | CC Strikers FC Vikings | Nolans J8/9A |
| 6 | 2021-05-22 | Under 8 | Avalon SC Pythons | 0 | 4 | Harbord FC Jets | Careel Bay J8/9A |
| 6 | 2021-05-22 | Under 9 | Harbord FC Leopards | 4 | 2 | CC Strikers FC Eagles | Nolans J8/9A |
| 6 | 2021-05-22 | Under 9 | Forest Killarney FC Rangers | 7 | 2 | Harbord FC Tigers | Killarney Heights Oval J8/9A |
| 6 | 2021-05-22 | Under 9 | Dee Why FC Wildcats | 9 | 0 | Harbord FC Foxes | Millers J8/9 |
| 6 | 2021-05-22 | Under 9 | Harbord FC Sharks | 4 | 1 | Dee Why FC Leopards | Nolans J8/9B |
| 6 | 2021-05-22 | Under 9 | Manly Vale FC Gunners | 0 | 2 | Harbord FC Pumas | David Thomas J8/9B |
| 6 | 2021-05-22 | Under 10 | Dee Why FC Magpies | 8 | 0 | Harbord FC Giants | Dee Why Oval 1J11 |
| 6 | 2021-05-22 | Under 10 | Narrabeen FC All Stars | 2 | 6 | Harbord FC Geckos | Boondah J10 |
| 6 | 2021-05-22 | Under 10 | Avalon SC Wildcats | 5 | 0 | Harbord FC Redbacks | Careel Bay J10 |
| 6 | 2021-05-22 | Under 11/2 | Harbord FC Dragons | 3 | 5 | Dee Why FC Rovers | Nolans J10 |
| 6 | 2021-05-22 | Under 11/3 | Forest Killarney FC Daredevils | 5 | 0 | Harbord FC Demons Forfeit | Melwood Oval 1J11 |
| 6 | 2021-05-22 | Under 11/5 | Manly Vale FC Kookaburras | 1 | 4 | Harbord FC Eagles | David Thomas J10A |
| 6 | 2021-05-22 | Under 12/1 | Harbord FC | 0 | 11 | CC Strikers FC | Nolans 4 |
| 6 | 2021-05-22 | Under 12/3 | Avalon SC | 3 | 2 | Harbord FC | Careel Bay 1 |
| 6 | 2021-05-22 | Under 12/4 | Wakehurst FC | 4 | 3 | Harbord FC | Lionel Watts Oval 2 |
| 6 | 2021-05-22 | Under 13/4 | Harbord FC | 2 | 1 | Saint Augustine’s FC A | Nolans 4 |
| 6 | 2021-05-22 | Under 14/4 | Harbord FC | 2 | 5 | Wakehurst FC | Nolans 4 |
| 6 | 2021-05-22 | Under 16/3 | Pittwater RSL FC | 4 | 0 | Harbord FC | Kitchener Park 1 |
| 10 | 2021-05-22 | PL | Harbord FC | 0 | 4 | Wakehurst FC | Harbord Park 1 |
| 10 | 2021-05-22 | PLR | Harbord FC Reserves | 2 | 6 | Wakehurst FC R | Harbord Park 1 |
| 7 | 2021-05-22 | AL1 | Avalon SC | 0 | 4 | Harbord FC | Careel Bay 1 |
| 7 | 2021-05-22 | AL1R | Avalon SC Reserves | 2 | 0 | Harbord FC R | Careel Bay 1 |
| 7 | 2021-05-22 | AL4 | Brookvale FC | 4 | 1 | Harbord FC | Grahams 2 |
| 7 | 2021-05-22 | AL5 | Seaforth FC | 3 | 1 | Harbord FC A | Tania Park 1 |
| 7 | 2021-05-22 | AL5 | Harbord FC B | 2 | 3 | Manly Vale FC B | Nolans 4 |
| 7 | 2021-05-22 | AL6 | Pittwater RSL FC B | 3 | 4 | Harbord FC | Jackson Road 1 |
| 7 | 2021-05-22 | O35/2 | Narrabeen FC | 0 | 2 | Harbord FC | Boondah 1 |
| 7 | 2021-05-22 | O35/3 | Narrabeen FC | 0 | 2 | Harbord FC | Boondah 2 |
| 7 | 2021-05-22 | O35/4 | Harbord FC | 6 | 2 | Mosman FC B | Nolans 4 |
| 7 | 2021-05-22 | O35/5 | Avalon SC | 2 | 1 | Harbord FC | Careel Bay 2 |
| Sunday 23 May | |||||||
| 5 | 2021-05-23 | W-Under 8 | CC Strikers FC Flames | 3 | 0 | Harbord FC Starfish | Tristram Rd J8/9A |
| 5 | 2021-05-23 | W-Under 9 | Harbord FC Wolves | 0 | 4 | Wakehurst FC Sunflowers | Nolans J8/9A |
| 5 | 2021-05-23 | W-Under 9 | Curl Curl FC Comets | 3 | 0 | Harbord FC Brumbies | Abbott Road J8/9A |
| 5 | 2021-05-23 | W-Under 10 | Manly Vale FC Comets | 1 | 1 | Harbord FC Crystals | David Thomas J10A |
| 5 | 2021-05-23 | W-Under 10 | Seaforth FC Bees | 1 | 1 | Harbord FC Opals | David Thomas J10A |
| 5 | 2021-05-23 | W-Under 11/2 | Harbord FC Emeralds | 0 | 4 | Forest Killarney FC Dragonflies | Nolans J10 |
| 5 | 2021-05-23 | W-Under 12/2 | Beacon Hill FC | 0 | 8 | Harbord FC | Beacon Hill 2 |
| 5 | 2021-05-23 | W-Under 12/3 | Harbord FC | 3 | 0 | Wakehurst FC | Harbord Park 1 |
| 6 | 2021-05-23 | W-Under 13/2 | Avalon SC | 0 | 4 | Harbord FC | Boondah 1 |
| 5 | 2021-05-23 | W-Under 14/2 | Forest Killarney FC | 0 | 3 | Harbord FC | Melwood Oval 1 |
| 5 | 2021-05-23 | Under 21/1 | Harbord FC A | 0 | 2 | Curl Curl FC | Abbott Road 5 |
| 6 | 2021-05-23 | W-AL1 | Harbord FC | 0 | 1 | CC Strikers FC A | Harbord Park 1 |
| 6 | 2021-05-23 | W-AL4 | Harbord FC | 10 | 0 | Manly Allambie FC | Harbord Park 1 |
| 6 | 2021-05-23 | W-40/1 | Forest Killarney FC | 1 | 1 | Harbord FC | Melwood Oval 2 |
