Ezzelino I da Romano, also known as Ezzelino il Balbo (died 1189) was an Italian nobleman of the Ezzelini family, who was lord of Onara, Romano, Bassano and Godego.
The son of Alberico and the grandson of the family's founder, Ecelo, in 1148 he took part in the Second Crusade along Louis VIII of France and Conrad III of Germany, fighting in Damascus and Ashkalon.
In 1175, together with Anselmo of Dovara, he commanded the Lombard League army who halted Frederick Barbarossa's march near Alessandria.
After the peace of Constance, he switched his allegiance from the Guelph to the Ghibelline party, and reconciled with the emperor.
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