| Jack Horrocks | Gibraltar | right-hand-bat | left-arm-fast-medium | T10, T20I |
| Jack Hunter | New Zealand | right-hand-bat | right-arm-fast-medium | T20 |
| Jack Hunter Lees | England | right-hand-bat | - | - |
| Jack Jarvis | Scotland | right-hand-bat | right-arm-fast-medium | ODI, T10, T20, T20I, Youth ODI |
| Jack Kemp | Jersey | right-hand-bat | - | T10, T20I |
| Jack Leach | England | left-hand-bat | slow-left-arm-orthodox | 4day, List A, T20, Test/5day |
| Jack Leaning | England | right-hand-bat | right-arm-offbreak | 4day, List A, ODI, T20 |
| Jack Lees | South Africa | left-hand-bat | right-arm-fast-medium | , T20, Youth ODI |
| Jack Morley | England | left-hand-bat | slow-left-arm-orthodox | 4day, List A, T20 |
| Jack Murphy | England | left-hand-bat | left-arm-fast-medium | - |
| Jack Murrell | India | right-hand-bat | - | T10 |
| Jack Nelson | England | right-hand-bat | legbreak | Youth ODI |
| Jack Nisbet | Australia | right-hand-bat | right-arm-fast-medium | 4day, List A, Youth ODI |
| Jack O’Neill | Scotland | - | - | T10 |
| Jack Palser | England | right-hand-bat | left-arm-fast | T10 |
| Jack Perman | Spain | right-hand-bat | legbreak | T10, T20I |
| Jack Plom | England | left-hand-bat | right-arm-fast-medium | List A, T20 |
| Jack Prestwidge | Australia | right-hand-bat | right-arm-fast-medium | 4day, List A, ODI, T10, T20 |
| Jack Shantry | England | left-hand-bat | left-arm-fast-medium | - |
| Jack Shutt | England | right-hand-bat | right-arm-offbreak | 4day, List A, T20 |
| Jack Sinfield | Australia | right-hand-bat | right-arm-offbreak | 4day, List A, Youth ODI |
| Jack Stevens | Jersey | left-hand-bat | left-arm-fast | T10 |
| Jack Taylor | England | right-hand-bat | right-arm-offbreak | 4day, List A, ODI, T10, T20 |
| Jack Tricker | England | right-hand-bat | - | - |
| Jack Whatmough | Bulgaria | - | - | T10 |
| Jack White | England | right-hand-bat | right-arm-fast-medium | 4day, List A, T20 |
| Jack Wildermuth | Australia | right-hand-bat | right-arm-fast-medium | 4day, List A, ODI, T20, Test/5day |
| Jack Wood | Australia | right-hand-bat | slow-left-arm-orthodox | T10, T20 |
| Jackson Bird | Australia | right-hand-bat | right-arm-fast-medium | 4day, List A, ODI, T20 |
| Jackson Coleman | Australia | right-hand-bat | left-arm-fast-medium | ODI, T20 |
| Jackson Edmonstone | Australia | - | - | ODI, T20 |
| Jackson Isakka | Australia | - | - | ODI |
| Jackson Outhutt | India | right-hand-bat | right-arm-fast-medium | T10 |
| Jackson Smith | Australia | - | - | T20 |
| Jackson Vijoy | Croatia | - | - | T10 |
| Jacob Albin | Bulgaria | right-hand-bat | right-arm-fast-medium | T10, T20I |
| Jacob Arratoon | Australia | right-hand-bat | right-arm-fast-medium | T10 |
| Jacob Basson | South Africa | left-hand-bat | left-arm-fast-medium | - |
| Jacob Bethell | England | left-hand-bat | slow-left-arm-orthodox | 100-Ball, 4day, List A, ODI, T20, T20I, Test/5day, Youth ODI |
| Jacob Butler | Isle of Man | - | - | T20I |
| Jacob Cotter | New Zealand | - | - | Youth ODI |
| Jacob Cumming | New Zealand | left-hand-bat | right-arm-fast-medium | 4day, List A, T20 |
| Jacob Dickman | Australia | - | - | ODI, T20 |
| Jacob Duffy | New Zealand | right-hand-bat | right-arm-fast-medium | 100-Ball, 4day, List A, ODI, T20, T20I, Test/5day |
| Jacob Lintott | England | right-hand-bat | slow-left-arm-orthodox | T20 |
| Jacob Mulder | Ireland Republic | - | - | T10 |
| Jacob Oram | New Zealand | left-hand-bat | right-arm-fast-medium | T20 |
| Jacob Rose | Australia | right-hand-bat | right-arm-fast-medium | T10 |
| Jacob Thorne | Australia | - | - | ODI |
| Jacques Banton | England | - | - | List A, T20 |