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Joining them on the first team were Phoenix Suns center Deandre Ayton, Memphis Grizzlies forward Jaren Jackson Jr and Sacramento Kings forward Marvin Bagley III.
It's the first time since 1984-85 that the top five picks in the draft made the first team. That year, Hakeem Olajuwon, Sam Bowie, Michael Jordan, Sam Perkins and Charles Barkley were honored.
Doncic and Young were named on all 100 ballots submitted by media members and are the leading contenders for Rookie of the Year honors, to be announced at the 2019 NBA Awards on June 24. Ayton, the No1 overall pick in the 2018 draft, is also a finalist.
Doncic (20) was a five-time Western Conference Rookie of the Month. He averaged 21.2 points, 7.8 rebounds and 6.0 assists and registered eight triple-doubles in 72 games.
Young (20) was a four-time Eastern Conference Rookie of the Month. He averaged 19.1 points, 8.1 assists and 3.7 rebounds and knocked down 156 three-pointers in 81 starts.
Making up the All-Rookie second team were Los Angeles Clippers guards Shai Gilgeous-Alexander and Landry Shamet, Cleveland Cavaliers guard Collin Sexton, New York Knicks center Mitchell Robinson and Hawks guard Kevin Huerter.