The 2018 World Junior Ice Hockey Championship Division II consisted of two tiered groups of six teams each: the fourth-tier Division II A and the fifth-tier Division II B. For each tier's tournament, the first-placed team was promoted to a higher division, while the last-placed team was relegated to a lower division.
The tournaments were played in a round-robin tournament format, with two points allotted for a win, one additional point for a regulation win, and one point for an overtime or game winning shots loss.
To be eligible as a junior, a player couldn't be born earlier than 1998.
Division II A was held in Dumfries, United Kingdom, while Division II B was hosted in Belgrade, Serbia.
Source: IIHF Rules for classification: 1) points; 2) head-to-head points; 3) head-to-head goal difference; 4) head-to-head number of goals scored; 5) result against closest best-ranked team outside tied teams; 6) result against second-best ranked team outside tied teams; 7) seeding before tournament. (H) Host Notes:
Source: IIHF Rules for classification: 1) points; 2) head-to-head points; 3) head-to-head goal difference; 4) head-to-head number of goals scored; 5) result against closest best-ranked team outside tied teams; 6) result against second-best ranked team outside tied teams; 7) seeding before tournament. (H) Host Notes: