2013 in rugby union
Here are the match results of the 2013 Rugby union season.
Qualifiers for the 2015 Rugby World Cup, meanwhile the Six Nations Championship and The Rugby Championship are set for another season.

International tournaments 
 2 February – 16 March: Six Nations Championship
 defended their RBS 6 Nations crown with a 30–3 victory against . 26th title.
 May 17: Amlin Challenge Cup Final at RDS Arena, Dublin:
  Leinster defeat  Stade Français 34–13 to claim the first Challenge Cup title for an Irish side.
 May 18: Heineken Cup Final at Aviva Stadium, Dublin:
  Toulon defeat  Clermont 16–15 to win their first European trophy.
 May 28 – June 9: 2013 IRB Junior World Rugby Trophy in Temuco, Chile
 ,  ,  . Italy claim their second title and earn promotion to the 2014 IRB Junior World Championship.
 June 1 – July 6: British and Irish Lions tour to Australia
 The Lions win the three-Test series against  2–1. It is the Lions' first series win since defeating  in 1997.
 June 5–23: 2013 IRB Junior World Championship in France
 ,  ,  . England win their first title. The  finishes last and is relegated to the 2014 IRB Junior World Rugby Trophy.
 August 17 – October 5: The Rugby Championship
  sweep all six matches for the second consecutive year, maintaining their 100% record since the competition was expanded to include Argentina in 2012. Including the competition's previous history as the Tri Nations, it is the 10th title for the All Blacks.

Rugby sevens 
 IRB Sevens World Series:
 ,  ,  . New Zealand claim their third consecutive series crown and 11th overall.
 World Series Core Team Qualifier: ,  and  all retain their core team status for the 2013–14 series.
 IRB Women's Sevens World Series:
 ,  ,  . New Zealand claim the inaugural series crown.
 June 28–30: 2013 Rugby World Cup Sevens in Moscow, Russia
 Men's:  ,  ,  . New Zealand win their second title.
 Women's:  ,  ,  . New Zealand win their first title.

Domestic competitions 
  Top League Final, 27 January at Chichibunomiya Rugby Stadium, Tokyo:
 Suntory Sungoliath defeat Toshiba Brave Lupus 19–3 to defend their title from last season. It is also Suntory's third league title overall.
 15 February – 13 July: Super Rugby: The  Chiefs top the regular-season table.
 Super Rugby Final, August 3 at Waikato Stadium, Hamilton, New Zealand:
 The Chiefs successfully defend their title from last season, defeating the  Brumbies 27–22. It is also the second Super Rugby title for the Chiefs.
 In the  South African promotion/relegation playoff, held over two legs on July 26 and August 3, the Lions defeat the Kings 44–42. The Lions will replace the Kings for the 2014 season.
  English Premiership Final, May 25 at Twickenham, London:
 Leicester Tigers defeat Northampton Saints 37–17 to claim their 10th Premiership crown.
 RFU Championship Final, May 23 and 30:
 Newcastle Falcons defeat Bedford Blues 49–33 on aggregate in the two-legged final. As Newcastle were confirmed as meeting the Premiership's minimum standards, they replaced the Premiership's bottom club, London Welsh.
  Top 14 Final, June 1 at Stade de France, Saint-Denis:
 Castres defeat Toulon 19–14 to claim their fourth title, and first since 1993.
 Rugby Pro D2:
 Oyonnax automatically promoted to Top 14 as champion. Brive also earn promotion as winner of playoffs between the next four teams. They replaced the bottom two teams in Top 14, Agen and Mont-de-Marsan.
     Pro12 Final, May 25 at RDS Arena, Dublin:
  Leinster, fresh off victory in the Amlin Challenge Cup, defeat  Ulster 24–18 for their third Celtic League/Pro12 title.
   LV Cup (Anglo-Welsh Cup):  Harlequins
  ITM Cup
 Premiership Final, October 26 at Westpac Stadium, Wellington:  defeat  29–13 to claim their sixth consecutive title in New Zealand's top level, and 11th overall.
 Championship Final, October 25 at Trafalgar Park, Nelson:   defeat  26–25 and are promoted to the 2014 ITM Premiership, replacing bottom-placed .
  Currie Cup Final, October 26 at Newlands, Cape Town:
 The  defeat Western Province 33–19 for their seventh Currie Cup crown.