HNK Rijeka Academy are the youth team of HNK Rijeka. There are a total of eleven age categories within the academy, the oldest being the Reserves Team (Rijeka II) and youngest being the Morčići (under-8).
From the 2014–15 season, HNK Rijeka Reserves (or Rijeka II) was formed and replaced the U-19 team. The reserve team competes in Croatia’s reorganised Third Division. The newly formed reserve teams in Croatian football have replaced the U-19 teams, with the national U-19 competition dissolved. The reserve teams are unable to play in the same division as their senior teams. Therefore, Rijeka II is ineligible for promotion to the Prva HNL and may progress only up to Druga HNL as long as the senior team is in Prva HNL. Reserve team is also not permitted to enter the Croatian Cup. The reserve team is intended to be the final step between the Academy and the first team, and is made up of promising youngsters between the age of 18 and 21, with up to five players over the age of 21 eligible to play each week.