Jan Felix Knobel (born 16 January 1989) is a German retired decathlete.

At the 2008 World Junior Championships in Bydgoszcz he won the title with 7896 points in the decathlon.

At the German Championships in 2009, Knobel took part in the senior class, although he would have been eligible to start in the juniors, and secured the victory with 7738 points.

Knobel's personal best is 8288 points, which he reached the end of May 2011 at the 2011 Hypo-Meeting in Götzis.

Since 2005, Knobel has competed for the athletics department of Eintracht Frankfurt and is coached by Jürgen Sammert.