Leopold I of Austria (1290 - 1326) was the co-Duke of Austria and Styria from 1308 until 1326. Leopold was the third son of King Albert I of the House of Habsburg. After his father was murdered by his cousin John Parricida, Leopold was made the co-ruler of the Habsburg domains of Austria and Styria with his brother Frederick I. Leopold was married to Catherine of Savoy. He died on 28 February 1326 in Strasbourg.