Lanfranc I of Bergamo (c. 895/900–950/954) was a northern Italian nobleman. He was a member of the dynasty known to historians as the Giselbertiners (or Giselbertini).

Lanfranc was the son of Giselbert I of Bergamo and Rotruda of Pavia.^[1]

Lanfranc is first documented as a royal vassal (vassus regis) in 935. By 945 he was entitled count (probably of Bergamo) in a diploma issued by Hugh of Italy. Later that year Lanfranc became count palatine of Bergamo through the intervention of Berengar II of Italy.^[2]

He died sometime between 950 and 954.^[3]

With his wife, whose name is not known, Lanfranc I had several children, including:

• Giselbert II of Bergamo
• Franca

• F. Menant, ‘Les Giselbertins, comtes du comté de Bergame et comtes palatins,’ in Formazione e strutture dei ceti dominanti nel medioevo (1988), pp. 115–186.
• J. Jarnut, Bergamo 568-1098. Verfassungs-, Sozial- und Wirtschaftsgeschichte einer lombardischen Stadt im Mittelalter (Wiesbaden, 1977).
• E. Hlawitschka, Franken, Alemannen, Bayern und Burgunder in Oberitalien, 774-962: Zum Verständnis der fränkischen Königsherrschaft in Italien (Freiburg im Breisgau, 1960), accessible online at: Genealogie Mittelalter