| Flag | Date | Use | Description |
| Link to file | 1894 | Cornwall County Cricket Club | |
| 1883 | Cornwall Rugby Football Union | A Saint Piran's Cross with two horizontal gold stripes in each quarter. |
| | Cornish Wrestling Association | A banner used by the Cornish Wrestling Association, based on that allegedly used by Cornish soldiers at Agincourt. The text above the wrestlers reads "KERNOW BYS VYKEN", and the text below the wrestlers reads "GWARY WHEK YU GWARY TEK". |
| | Cornish Maritime Trust | A long white pennant surrounded by a red border and defaced with the name "CORNISH MARITIME TRUST" in red. |
| 1928 | Gorsedh Kernow | |
| 1920 | Isles of Scilly Steamship Company | A white cross on a blue field, with each quarter containing one of the company's initials in red. |
| Flag | Date | Use | Description |
| 1972 | Cargreen Yacht Club | A green burgee defaced with a red brick chimney outlined in black in the hoist. |
| 1921 | Flushing Sailing Club | A black burgee defaced with a gold letter "V". |
| 1948 | Helford River Sailing Club | A blue burgee divided by a red cross outlined in white, with a gold ship in the centre. |
| 1934 | Looe Sailing Club | A diagonally divided burgee of seven red and yellow stripes defaced with a black silhouette of a ship on the waves. |
| | Mount's Bay Sailing Club | |
| 1963 | Mylor Yacht Club | A white burgee divided by a red Saint George's Cross with the shield from the arms of the Duchy of Cornwall in the canton. |
| 1965 | Padstow Sailing Club | A white burgee defaced with a red-and-white fish and surrounded by a blue border. |
| 1939–1990s | Penzance Sailing Club | A white burgee defaced with a black skull and crossbones. |
| 1990s | Penzance Sailing Club | A black burgee divided by a white Saint Piran's Cross, with a black skull and crossbones on a white disc in the centre. |
| 1958 | Port Navas Yacht Club | A black burgee with the white-coloured initials "PNYC" arranged vertically in the hoist and separated from the rest of the burgee by a vertical white line, and the rest of the burgee divided by a white Saint Piran's Cross with a gold ship's wheel to the upper left of the cross. |
| 1951 | Porthpean Sailing Club | A blue burgee divided by a white cross, defaced in the centre with a white shield bearing a red saltire. |
| 1974 | The Quay Sailing Club | A white burgee with a crimson border, defaced with a white shield containing three black bells in the hoist, and the black-coloured initials "Q.S.C." in the fly. |
| 1933 | Restronguet Sailing Club | A blue burgee defaced with a white seashell and surrounded by a white border. |
| 1938 | Rock Sailing and Waterski Club | A yellow burgee defaced with a black silhouette of a camel. |
| | 1871 | Royal Cornwall Yacht Club | Blue Ensign, with the Prince of Wales's feathers heraldic badge. |
| | 1880 | Royal Fowey Yacht Club | Red Ensign, with the coat of arms of the Duke of Cornwall. |
| | 1972 | St Ives Sailing Club | |
| 1920 | St Mawes Sailing Club | A white-and-red quartered burgee with the shield from the arms of the Duchy of Cornwall in the canton. |
| 1898 | Saltash Sailing Club | |
| 1891 | Torpoint Mosquito Sailing Club | A dark blue burgee divided by a white cross and defaced with a red diamond in the centre. |