Smallest victories by Galle Cricket Club in T20s
By runs
Winner | Margin | Balls Rem | Target | Overs | Opposition | Ground | Match Date | Scorecard |
| 13 runs | 0 | 182 | 20.0 | v Kandy CCC | Colombo (Bloomfield) | 21 Feb 2019 | Twenty20 | |
| 15 runs | 0 | 149 | 19.1 | v Lankan CC | Colombo (NCC) | 2 Mar 2018 | Twenty20 | |
| 22 runs | 0 | 140 | 19.1 | v Kandy CCC | Colombo (PSS) | 31 May 2023 | Twenty20 | |
| 24 runs | 0 | 146 | 19.1 | v Kandy CCC | Colombo (SSC) | 13 Mar 2021 | Twenty20 | |
| 37 runs | 0 | 99 | 14.4 | v SL Navy | Colombo (CCC) | 2 Jun 2022 | Twenty20 | |
| 38 runs | 0 | 143 | 20.0 | v Lankan CC | Colombo (Bloomfield) | 29 Oct 2005 | Twenty20 | |
| 40 runs | 0 | 108 | 16.2 | v Kurunegala | Colombo (CCC) | 24 May 2022 | Twenty20 | |
| 64 runs | 0 | 148 | 16.3 | v Badureliya | Colombo (CCC) | 16 Feb 2019 | Twenty20 |
By wickets
Winner | Margin | Balls Rem | Target | Overs | Opposition | Ground | Match Date | Scorecard |
| 1 wicket | 3 | 96 | 19.3 | v Unichela SC | Colombo (CCC) | 10 Jan 2020 | Twenty20 | |
| 5 wickets | 5 | 128 | 19.1 | v Panadura | Colombo (Burgher) | 8 Jan 2020 | Twenty20 | |
| 5 wickets | 1 | 135 | 19.5 | v Nugegoda SWC | Colombo (NCC) | 14 Mar 2021 | Twenty20 | |
| 5 wickets | 9 | 131 | 18.3 | v Negombo | Colombo (PSS) | 4 Jun 2023 | Twenty20 | |
| 6 wickets | 9 | 165 | 18.3 | v Lankan CC | Colombo (CCC) | 19 Feb 2019 | Twenty20 | |
| 8 wickets | 49 | 84 | 11.5 | v Burgher | Panagoda | 15 Feb 2019 | Twenty20 |
By balls remaining in the second innings
Winner | Margin | Balls Rem | Target | Overs | Max | Opposition | Ground | Match Date | Scorecard |
| 5 wickets | 1 | 135 | 19.5 | 20.0 | v Nugegoda SWC | Colombo (NCC) | 14 Mar 2021 | Twenty20 | |
| 1 wicket | 3 | 96 | 19.3 | 20.0 | v Unichela SC | Colombo (CCC) | 10 Jan 2020 | Twenty20 | |
| 5 wickets | 5 | 128 | 19.1 | 20.0 | v Panadura | Colombo (Burgher) | 8 Jan 2020 | Twenty20 | |
| 6 wickets | 9 | 165 | 18.3 | 20.0 | v Lankan CC | Colombo (CCC) | 19 Feb 2019 | Twenty20 | |
| 5 wickets | 9 | 131 | 18.3 | 20.0 | v Negombo | Colombo (PSS) | 4 Jun 2023 | Twenty20 | |
| 8 wickets | 49 | 84 | 11.5 | 20.0 | v Burgher | Panagoda | 15 Feb 2019 | Twenty20 |
Tied matches
Team 1 | Team 2 | Ground | Match Date | Scorecard |
| Tamil Union | Galle CC | Chilaw Marians Cricket Club Ground, FTZ Sports Complex | 27 Feb 2018 | Twenty20 |
| Galle CC | KTC | Nondescripts Cricket Club Ground, Colombo | 5 Jun 2022 | Twenty20 |
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