The 1990–91 I-Divisioona season was the 17th season of the I-Divisioona, the second level of Finnish ice hockey. 12 teams participated in the league, and JoKP Joensuu won the championship and was promoted to the SM-liiga. Kärpät Oulu finished second and was able to participate in the promotion/relegation round of the SM-liiga.
| Graph IRI | Count |
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| http://dbkwik.webdatacommons.org | 7 |