Rudolph Johann Joseph Rainier, Archduke of Austria, Cardinal and Archbishop of Olomouc (8 January 1788 – 24 July 1831), was a member of the House of Habsburg-Lorraine, and an Austrian clergyman and noble. He was consecrated as Archbishop of Olomouc (Olmütz) in 1819 and became cardinal in the same year. Born in the Pitti Palace in Florence, Tuscany, he was the youngest son of Emperor Leopold II and Maria Louisa of Spain. In 1803 or 1804, Rudolph began taking lessons in piano and composition from Ludwig van Beethoven. The two became friends, and Rudolph became a supporter and patron of Beethoven; their meetings continued until 1824. On 24 March 1819 aged 31 Rudolph was appointed, Archbishop of Olomouc, in the present day Czech Republic but then part of the Austrian Empire. He was made Cardinal-Priest of the titular church of S. Pietro in Montorio by Pope Pius VII on 4 June 1819. He was ordained a priest on 29 August 1819, and consecrated a bishop on 26 September.

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