2018 in rugby union
International rugby sevens events
- May 19 & 20: ERSS #1 in Moscow
- * Cup: ; Plate: ; Bowl:
- June 30 & July 1: ERSS #2 in Marcoussis
- * Cup: ; Plate: ; Bowl:
- July 7 & 8: ERSS #3 in Exeter
- * Cup: ; Plate: ; Bowl:
- September 8 & 9: ERSS #4 in Łódź
- * Cup: ; Plate: ; Bowl:
National teams
Club teams
- August 26, 2017 – June 2: 2017–18 Top 14
- * Castres defeated Montpellier 29–13 in the final to win their fifth Top 14 title.
- September 1, 2017 – May 26:
- * 2017–18 Aviva Premiership
- ** Saracens defeated reigning champion Exeter Chiefs 27–10 in the final to win their third title in four years and fourth overall.
- * //// 2017–18 Pro14
- ** Leinster defeated defending champion Scarlets 40–32 in the final for the inaugural title of the Pro14 era and Leinster's fifth since Pro14 launched in 2001 as the Celtic League.
- October 12, 2017 – May 11: 2017–18 European Rugby Challenge Cup
- * Cardiff Blues defeated Gloucester 31–30 in the final at Bilbao for their second Challenge Cup crown.
- October 13, 2017 – May 12: 2017–18 British and Irish Cup
- * Ealing Trailfinders defeated Leinster A 22–7 to win their first British and Irish Cup title.
- October 13, 2017 – May 12: 2017–18 European Rugby Champions Cup
- * Leinster defeated Racing 92 15–12 in the final at Bilbao for their first title in the Champions Cup era and fourth overall European club championship.
- January 13 – May 12: 2017–18 European Rugby Continental Shield
- * Enisey-STM defeated Heidelberger RK 24–20 in the final. Both finalists had been set to qualify for the 2018–19 European Rugby Challenge Cup, with Heidelberg to become the first German side ever to participate in that competition. However, Heidelberg were barred from the Challenge Cup due to Hans-Peter Wild's ownership of both this club and French side Stade Français.
- November 3, 2017 – March 18: / 2017–18 Anglo-Welsh Cup
- * Exeter Chiefs defeated fellow English team Bath 28–11 to win their second Anglo-Welsh Cup title. This was also the final Anglo-Welsh Cup, as the Welsh Rugby Union pulled out of the competition in favour of a dedicated U-23 competition. For the English sides, it will be replaced by the Premiership Rugby Cup from 2018 to 2019.
- February 17 – August 4: //// 2018 Super Rugby season
- * The Crusaders defeated the Lions, 37–18, to win their second consecutive and ninth overall Super Rugby title.
- April 21 - July 7: 2018 Major League Rugby season
- * Seattle Seawolves defeated Glendale Raptors
- August 17 – October 27: 2018 Currie Cup Premier Division
- * The Sharks defeated the Western Province, 17–12, to win their eighth Currie Cup title.
- August 17 – October 27: 2018 Mitre 10 Cup
- * Team Auckland defeated team Canterbury, 40–33 at extra time, to win their second Mitre 10 Cup title.
- September 1 – October 27: / 2018 National Rugby Championship
- * Fijian Drua defeated Queensland Country, 36–26, to win their first National Rugby Championship title.