Reginald I

• Reginald I, [Count of Burgundy], Count of the Free County of Burgundy from 1026
• Reginald I, Count of Bar, called "the One-eyed", Count of Bar from 1105
• Reginald I of Guelders, Count of Guelders from 1271
• Rögnvaldr Óláfsson (fl. 1164), referred to in some texts as Reginald, ruler of the Isle of Man for a brief period in 1164