Bernard I (or Bernardo, Bernhard) may refer to:
- Bernard of Septimania, also known as Bernard I of Toulouse (born 795)
- Bernard I of Poitiers (died 844)
- Bernard I of Armagnac (died 995), called 'the Suspicious', first duke of Armagnac
- Bernard I William of Gascony (died c. 1009)
- Bernard I, Duke of Saxony (died 1011)
- Bernard I of Bigorre, (962–1034)
- Bernard I of Berga, count of Berga in 1035–1050
- Bernard II Tumapaler of Gascony (died 1064x1090), sometimes counted as Bernard I
- Bernard I de Balliol (died 1164)
- Bernard I, Margrave of Baden-Baden (died 1431)
- Bernard I, Duke of Brunswick-Lüneburg (died 1434)
- Bernardo I of Kongo (died 1567)
This disambiguation page lists articles about people with the same name.
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