|Sport||League of Legends|
|No. of teams||13|
| G2 Esports|
|Most titles|| SK Telecom T1|
|Qualification||Winners of regional leagues in Spring split .|
|TV partner(s)||Twitch, YouTube|
|Level on pyramid||Major|
The Mid-Season Invitational (MSI) is an annual League of Legends tournament hosted by publisher Riot Games since 2015. It is the second most important international League of Legends tournament aside from the World Championship.
In 2015 and 2016, the event featured the Spring Split champions of the five major competitive League of Legends regional leagues (LEC, LCS, LCK, LMS, LPL), as well as a wildcard team from a less region determined by the International Wildcard Invitational, held a few weeks beforehand. In its inaugural tournament, Chinese team Edward Gaming emerged victorious by defeating South Korean team SK Telecom T1 3–2 in the final.
Since 2017, Spring Split champions of all regions will qualify for the event. The International Wildcard Invitational was replaced by the Play-in Stage. The best Wildcard region in MSI will directly receive a spot in the World Championship's Group Stage for that year for their Summer Split champion. The top four regions in MSI will get the pool-1 spot in the World Championship's Group Stage.
SK Telecom T1 from South Korea is the most successful team with two MSI titles (2016 and 2017).
|Winner||Score||Runner-up||5th Place||6th Place|
|2015||Tallahassee||Edward Gaming||3||2||SK Telecom T1||ahq e-Sports Club||Fnatic||Team SoloMid||Beşiktaş e-Sports Club|
|2016||Shanghai||SK Telecom T1||3||0||Counter Logic Gaming||Flash Wolves||Royal Never Give Up||G2 Esports||SuperMassive eSports|
|2017||São Paulo & Rio de Janeiro||SK Telecom T1||3||1||G2 Esports||Team WE||Flash Wolves||Team SoloMid||GIGABYTE Marines|
|Royal Never Give Up||3||1||Kingzone DragonX||Flash Wolves||Fnatic||Team Liquid||EVOS Esports|
|2019|| Ho Chi Minh City & Hanoi
|G2 Esports||3||0||Team Liquid||SK Telecom T1||Invictus Gaming||Flash Wolves||Phong Vũ Buffalo|
Teams reaching top four
Regions reaching top four
- Erzberger, Tyler (May 2, 2016). "The Mid-Season Invitational Power Rankings". ESPN. ESPN Inc. Retrieved May 11, 2016.
- Lingle, Samuel (May 4, 2016). "League Midseason Invitational day one recap". The Daily Dot. Retrieved May 11, 2016.
- Johnson, Michael (May 3, 2016). "League Of Legends Mid-Season Invitational – What You Need To Know!". Rock, Paper, Shotgun. Retrieved May 11, 2016.
- Scott, Jake (May 1, 2015). "MSI recap: Edward Gaming defeat SKT 3-2, become MSI 2015 champions". theScore eSports. Score Media Ventures. Retrieved May 11, 2016.
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