Smallest victories For Inter-Insular T20 Series
By runs
Winner | Margin | Balls Rem | Target | Overs | Opposition | Ground | Match Date | Scorecard |
| 3 runs | 0 | 131 | 20.0 | v Guernsey | St Saviour | 7 Jun 2025 | T20I # 3209 | |
| 6 runs | 0 | 129 | 20.0 | v Guernsey | St Martin | 18 Aug 2018 | Other T20 | |
| 13 runs | 0 | 53 | 10.0 | v Jersey | St Saviour | 6 Jun 2025 | T20I # 3204 | |
| 14 runs | 0 | 123 | 20.0 | v Guernsey | St Martin | 17 Aug 2018 | Other T20 | |
| 37 runs | 0 | 179 | 20.0 | v Guernsey | St Peter Port | 20 May 2022 | T20I # 1542 | |
| 37 runs | 0 | 186 | 20.0 | v Guernsey | Castel | 21 May 2022 | T20I # 1545 | |
| 41 runs | 0 | 165 | 20.0 | v Guernsey | Castel | 1 Jun 2019 | T20I # 789 | |
| 60 runs | 0 | 169 | 20.0 | v Guernsey | Castel | 21 May 2022 | T20I # 1543 | |
| 76 runs | 0 | 172 | 18.4 | v Guernsey | Castel | 1 Jun 2019 | T20I # 790 |
By wickets
Winner | Margin | Balls Rem | Target | Overs | Opposition | Ground | Match Date | Scorecard |
| 4 wickets | 6 | 152 | 19.0 | v Guernsey | St Martin | 8 Jul 2023 | T20I # 2122 | |
| 4 wickets | 5 | 149 | 19.1 | v Jersey | Port Soif | 23 Jun 2024 | T20I # 2718 | |
| 7 wickets | 28 | 135 | 15.2 | v Guernsey | St Martin | 7 Jul 2023 | T20I # 2121 | |
| 7 wickets | 11 | 157 | 18.1 | v Guernsey | Castel | 22 Jun 2024 | T20I # 2714 | |
| 7 wickets | 5 | 114 | 12.1 | v Guernsey | St Saviour | 7 Jun 2025 | T20I # 3207 | |
| 8 wickets | 14 | 111 | 17.4 | v Guernsey | St Martin | 18 Aug 2018 | Other T20 | |
| 8 wickets | 51 | 135 | 11.3 | v Guernsey | Castel | 22 Jun 2024 | T20I # 2715 |
By balls remaining in the second innings
Winner | Margin | Balls Rem | Target | Overs | Max | Opposition | Ground | Match Date | Scorecard |
| 4 wickets | 5 | 149 | 19.1 | 20.0 | v Jersey | Port Soif | 23 Jun 2024 | T20I # 2718 | |
| 7 wickets | 5 | 114 | 12.1 | 13.0 | v Guernsey | St Saviour | 7 Jun 2025 | T20I # 3207 | |
| 4 wickets | 6 | 152 | 19.0 | 20.0 | v Guernsey | St Martin | 8 Jul 2023 | T20I # 2122 | |
| 7 wickets | 11 | 157 | 18.1 | 20.0 | v Guernsey | Castel | 22 Jun 2024 | T20I # 2714 | |
| 8 wickets | 14 | 111 | 17.4 | 20.0 | v Guernsey | St Martin | 18 Aug 2018 | Other T20 | |
| 7 wickets | 28 | 135 | 15.2 | 20.0 | v Guernsey | St Martin | 7 Jul 2023 | T20I # 2121 | |
| 8 wickets | 51 | 135 | 11.3 | 20.0 | v Guernsey | Castel | 22 Jun 2024 | T20I # 2715 |
Tied matches
Team 1 | Team 2 | Ground | Match Date | Scorecard |
| Guernsey | Jersey | College Field, St Peter Port | 31 May 2019 | T20I # 788 |
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