The 2018 World Junior Figure Skating Championships were held in Sofia, Bulgaria from 5–11 March 2018.

[1] The following new junior records were set during this competition: The ISU stipulates that the minimum scores must be achieved at an ISU-recognized junior international competition in the ongoing or preceding season, no later than 21 days before the first official practice day.

[3] Based on the results of the 2017 Junior World Championships, each ISU member nation fielded one to three entries per discipline.

The International Skating Union published the full list of entries on 13 February 2018.

The leader from the short program, Alexei Krasnozhon, sustained an injury on his first jumping pass, a quad Salchow, and subsequently withdrew from the competition.