Friedrich Pein (20 October 1915 – 14 February 1975) was an Austrian sniper in the Wehrmacht of Nazi Germany during World War II, and one of two to have been awarded the Knight's Cross of the Iron Cross, the other being Matthias Hetzenauer.
Pein enlisted in the Wehrmacht in October 1938.
His served as a sniper in the 143d Gebirgsjäger Regiment of the 6th Mountain Division on the Eastern Front.
In early 1944, he was transferred to the 100th Jäger Division.
On February 28, 1945, he was awarded the Knight's Cross of the Iron Cross marking his 200th kill as a sniper.