Siegmund Walter "Sigi" Nissel OBE (3 January 1922 – 21 May 2008) was an Austrian-born British violinist who played second violin in the Amadeus Quartet and served as its administrator. Sigi Nissel was born in Munich to a Jewish family from Vienna. He began playing the violin at the age of 6. His mother died when he was 9. He was taken by his father to Vienna, where his teachers included . Nissel was evacuated from Vienna in 1938 to Great Britain. Nissel played the "Payne" Stradivarius of 1731. He married the statistician Muriel Griffiths in 1957, and they had a daughter Claire and a son Daniel.