| 2017 NA LCS season | |
| League: | NA LCS |
| Sport: | League of Legends |
| No Of Teams: | 10 |
| Tv: | Twitch, YouTube |
| Season: | Spring |
| Top Seed: | Team SoloMid |
| Mvp: | Noh "Arrow" Dong-hyeon |
| Season Champ Name: | Champions |
| Season Champs: | Team SoloMid |
| Second Place: | Cloud9 |
| Season2: | Summer |
| Top Seed2: | Team SoloMid |
| Mvp2: | Søren "Bjergsen" Bjerg |
| Season Champ2 Name: | Champions |
| Season Champs2: | Team SoloMid |
| Second Place2: | Immortals |
| Season3: | Regional finals |
| Season Champ3 Name: | Winner |
| Season Champs3: | Cloud9 |
| Seasonslistnames: | NA LCS |
| Prevseason Link: | 2016 NA LCS season |
| Prevseason Year: | 2016 |
| Nextseason Link: | 2018 NA LCS season |
| Nextseason Year: | 2018 |
The 2017 NA LCS season was the sixth season of the North American League of Legends Championship Series (NA LCS), a professional esports league for the video game League of Legends. The season was divided into two splits: Spring and Summer. The Spring Split began on January 20 and culminated with the playoff finals on April 23, 2017. The Summer Split began on June 2 and culminated with the Spring Split finals on September 3, 2017.
Team SoloMid won the spring split playoffs, qualifying them for the 2017 Mid-Season Invitational. Team SoloMid also won the summer split playoffs, directly qualifying them for the 2017 World Championship. Immortals and Cloud9 also qualified for the 2017 World Championship via Championship Points and winning the regional qualifier, respectively.
The Spring Split regular season began on January 20, 2017. The regular season followed a standard double round-robin format, where each team faced every other team twice.[1]
The bottom two teams from the regular season were relegated to the summer promotional tournament, where they competed with the top two teams from the League of Legends Challenger Series. The tournament was held from March 31 to April 2, 2017, and followed a double-elimination format. The top two teams advanced to the summer split.[2]
The top six teams from the regular season advanced to the playoffs, a single-elimination tournament, which ran from April 8 to April 23, 2017. Of the six teams, the top two started in the semifinals, while the bottom four started in the quarterfinals. All matches were in a best-of-five format. Unlike the previous year, the top seed in the semifinals would play the lowest seed that advanced from the quarterfinals.[3] The winner of the playoffs advanced to the 2017 Mid-Season Invitational.[4] The Spring Split playoffs third place match and final was played at the Pacific Coliseum in Vancouver, Canada.[5]
The Summer Split regular season ran from June 2 to August 6, 2017.[7]
The bottom two teams from the regular season were relegated to the promotion tournament, where they competed with the top two teams from the Challenger Series. The tournament was held from August 11 to 13, 2017, and followed a double-elimination format. The top two teams advanced to the 2018 spring split.[8]
The top six teams from the summer regular season secured spots in the Summer Split playoffs, which ran from August 19 to September 3, 2017. The playoffs were a single-elimination tournament, with top two teams starting in the semifinals and the following four starting in the quarterfinals. All matches were in a best-of-five format. The winner of the summer playoffs directly qualified for the 2017 World Championship.[9] The Summer Split playoffs third place match and final were played at the TD Garden in Boston, Massachusetts.[10]