| 24/01 to 02/02 | Tennis Leinster Events Part 1 Junior Tour 100 & 200 | |
| 25/01 to 02/02 | Red, Orange & Green Ball Leinster Part 49 | |
| 16/02 to 19/02 | Tennis Leinster Midterm Events Part 2 Junior Tour 100 & 200 | |
| 21/02 to 21/02 | Red, Orange & Green Ball Leinster Mid Term 2026 | |
| 21/02 to 07/03 | Tennis Leinster Events Part 3 Junior Tour 100 & 200 | |
| 21/02 to 17/05 | 2026 Leinster Spring League U10 and U12 | |
| 22/02 to 10/05 | 2026 Leinster Spring League U18 | |
| 22/02 to 17/05 | 2026 Leinster Spring League U15 | |
| 28/02 to 28/02 | Leinster Spring Day Cup 2026 | |
| 01/03 to 24/05 | 2026 Leinster Regional Spring League | |
| 05/03 to 21/05 | 2026 Leinster Primary Schools League | |
| 07/03 to 22/03 | Red, Orange & Green Ball Leinster Part 50 | |
| 07/03 to 23/05 | 2026 Leinster Junior Regional Spring League | |
| 14/03 to 15/03 | Tennis Leinster Events Part 4 Junior Tour 100 & 200 | |
| 09/04 to 10/04 | Tennis Leinster Junior Tour 200 April Events 2026 | |
| 16/04 to 19/05 | 2026 Grant Thornton Girls Leinster Secondary Schools League supported by Head | |
| 25/04 to 26/04 | Red, Orange & Green Ball Leinster Tour Part 51 | |
| 10/05 to 17/05 | Red, Orange & Green Ball Leinster Tour Part 52 | |
| 24/05 to 24/05 | Tennis Leinster and Elm Park Junior Tour 100 | |
| 30/05 to 30/05 | Red, Orange & Green Ball Leinster Train2Compete Day 2026 | |
| 13/06 to 13/06 | Tennis Leinster Summer Day Cup 2026 | |
| 18/06 to 26/06 | Tennis Leinster Junior Tour 100 Summer Event | |
| 27/06 to 30/07 | Red, Orange & Green Ball Leinster Tour Part 53 | |
| 29/06 to 02/07 | Tennis Leinster Junior Tour 100 & 200 Summer Events Part 1 | |
| 06/07 to 09/07 | Tennis Leinster Junior Tour 100 & 200 Summer Events Part 2 | |
| 18/07 to 18/07 | Tennis Leinster Summer Day Cup Part 2 | |
| 18/07 to 19/07 | Tennis Leinster and Glenageary Junior Tour 100 Event | |
| 20/07 to 23/07 | Tennis Leinster Junior Tour 100 & 200 Summer Events Part 3 | |
| 01/08 to 04/10 | Leinster Ladies Singles League 2026 | » Matches |
| 01/08 to 04/10 | Leinster Mens Singles League 2026 | » Matches |
| 07/08 to 08/08 | Under 18 Inter-Provincial Championships 2026 | |
| 09/08 to 10/08 | National Inter-Provincial Championships 2026 | |
| 12/08 to 20/08 | Tennis Leinster Junior Tour 100 & 200 Summer Events Part 4 | |
| 28/08 to 29/08 | 30, 35, 40 & 45 Inter-Provincial Championships 2026 | |
| 26/09 to 21/11 | 2026 Leinster U10 and U12 Autumn League | » Matches |
| 26/09 to 28/11 | Leinster Regional Junior Autumn League 2026 | » Matches |
| 27/09 to 27/09 | Tennis Leinster Autumn Day Cup 2026 | |
| 03/10 to 17/10 | Red, Orange & Green Ball Leinster Tour Part 54 | » Online entry |
| 11/10 to 06/12 | 2026 Leinster Regional Winter League | » Online entry |