| prevseason = 2024–25 | nextseason = 2026–27 }} The 2025–26 season was Leinster Rugby's fifth season in the United Rugby Championship (URC), their 32nd season of professional rugby and their 138th season of representative rugby since their foundation. Along with competing in the URC and its Irish Shield competition, both of which it entered aschampion, the club also participated in the 2025–26 European Rugby Champions Cup. Leinster opened the URC season with an away tie at Stormers on 26 September 2025.
Leinster emerged once again as United Rugby Championship champions, defeating Pretoria Bulls 36-7 in Dublin in the Grand final, in a repeat of the previous years final. They retained the URC Irish Shield for a fifth time, but were runners-up for a record fifth time in the European Rugby Champions Cup, losing to Bordeaux-Begles in Bilbao.
Leinster Women will contest the 2025 IRFU Women's Interprovincial Series as defending champions, opening their season on 10 August 2025 against Ulster Women. They lost the final to Munster Rugby Women. They also fielded the combined Wolfhounds team, with Ulster Rugby in the 2025–26 Celtic Challenge, once more as defending champions, and retained the title.
Leinster Men
Transfers
Preseason
Leinster's pre-season campaign consisted of a single match, hosting Cardiff at the South Dublin Tallaght Stadium.
United Rugby Championship
Matches The full itinerary of matches was released on 21 May 2025.
Table
Playoffs
Quarter-final
Semi-final
URC Grand Final
URC Irish Shield
European Rugby Champions Cup Leinster were drawn in Pool 3 of the European Rugby Champions Cup alongside fellow URC side Stormers (whom Leinster did not play in line with the competition's rules), Harlequins, Leicester Tigers, Bayonne and erstwhile rivals La Rochelle. The full fixture details were released on 15 July 2025.
Pool stage
Knockout stage Leinster qualified for the round of sixteen when they confirmed a top four finish in Pool 3 in Round 3. They confirmed a top four seeding, a home tie in the round of 16, and a potential home quarter-final, with victory over Bayonne in Round 4 of Pool 3. In the round of 16, Leinster will host Edinburgh as third seeds overall.
Round of 16
Quarter-final
Semi-final
Final
Leinster Women
IRFU Women's Interprovincial Series
The 2025 IRFU Women's Interprovincial Series is being contested by women's teams representing the four provincial rugby unions of Ireland, under the same branding and uniforms as the senior men's teams in the United Rugby Championship. The competition uses a single round-robin format, similar to the one used in both the Six Nations Championship and the Women's Six Nations Championship. Each team plays the other three teams once.
As in previous seasons the competition also features playoffs and a final.
Leinster Women returned as defending champions, but lost in the final to Munster Women.
Table
Matches
Final
Celtic Challenge
The 2025–26 Celtic Challenge was the fourth season of the Celtic Challenge, a cross-border women's rugby union competition with teams from Ireland, Wales and Scotland. The six-team tournament featured a double-round robin fixture series, with each team playing the others both home and away. For the first time, the competition will include a finals series with semi-finals and a grand final.
Wolfhounds, a combined team representing Leinster and Ulster, return as two-time defending champions.
Table
Matches
Play-offs
References