Heinrich de Ahna was a German violinist and music teacher. He was born in Vienna and was the brother of the singer Eleonore de Ahna and uncle of the singer Pauline de Ahna.
He studied in Vienna with Joseph Mayseder and in Prague with Moritz Mildner, making his solo debut in 1846. In his youth, he toured Germany and England with his father. In 1849, the Duke of Saxe-Coburg and Gotha awarded him the title of chamber virtuoso.
In 1851, de Ahna entered the Austrian army and attained the rank of first lieutenant during the Sardinian War. After leaving military service and undertaking several further concert tours, he settled in Berlin in 1862.
From 1869, he served as Joseph Joachim's principal assistant at the Berlin Academy of Music, where he taught his own class. Together with Eduard Rappoldi, he substituted for Joachim during his absences. His pupils included David Mannes and Gustav Dannreuther.
In 1869, de Ahna also joined the renowned Joachim Quartet, initially as violist. From 1871 until his death, he was the ensemble's second violinist. He took part in several premieres, including Johannes Brahms's String Quartet No. 2 in 1873.