League of Legends Challenger Series

{{Short description|Two professional League of Legends leagues}}

{{DISPLAYTITLE:League of Legends Challenger Series}}

{{Use dmy dates|date=December 2020}}

{{Infobox sports league

| title = League of Legends Challenger Series

| last_season =

| logo = League of Legends Challenger Series Logo 2017 HR.png

| logo_size = 150px

| caption =

| formerly =

| sport =

| game = League of Legends

| founded = 2014

| folded = 2017

| replaced = European Masters (Europe)
LCS Academy (North America)

| owner = Riot Games

| ceo =

| coo =

| director =

| president =

| commissioner =

| fame =

| motto =

| inaugural =

| teams = 10 in Europe
10 in North America

| singles =

| venue =

| continents = Europe, North America

| champion =

| champ_season =

| most_champs =

| classification =

| qualification =

| tv =

| sponsor =

| investor =

| related_comps =

| founder =

| levels =

| promotion = League of Legends Championship Series

| relegation =

| domestic_cup =

| website =

| footnotes =

}}

The League of Legends Challenger Series (CS) were two professional League of Legends leagues, one in Europe (EU CS) and one in North America (NA CS), that were the second highest level of professional League of Legends in those regions. The two highest-placing teams from the Challenger Series played in the League of Legends Promotion Tournament against the two lowest-placing League of Legends Championship Series (LCS) teams, the winners of which were promoted to the Championship Series in each region, whereas the losers were relegated to the Challenger Series.{{cite news|url=https://dotesports.com/general/lcs-expansion-tournament-details-683|title=LCS expansion tournament details finally revealed|last=Barker|first=Ian J.|date=17 September 2014|work=Dot Esports|access-date=7 June 2017|language=en-US}} The league was announced in December 2013 and began play for the Spring 2014 season.{{cite web|url=https://www.polygon.com/2013/10/3/4798414/league-of-legends-challenger-league-riot-games-coke-zero-esports|title=How the new League of Legends Challenger league will create a pathway to the pros|last=Sarkar|first=Samit|date=3 October 2013|website=Polygon|access-date=7 June 2017|archive-date=9 December 2016|archive-url=https://web.archive.org/web/20161209104206/http://www.polygon.com/2013/10/3/4798414/league-of-legends-challenger-league-riot-games-coke-zero-esports|url-status=live}} Both the NA and EU CS were discontinued in 2018 in preparation for league franchising.