Friedrich Carl Gröger (14 October 1766 in Plön – 9 November 1838 in Hamburg) was a north-German portrait painter and lithographer.
One of the most respected portraitists of his time in northern Germany, his works are to be found in several museums, including the Hamburger Kunsthalle, as well as in north German, Holstein and Danish private collections.
He and Aldenrath then went together to Hamburg, then on a joint study trip to Dresden and Paris, then back to Lübeck, where he worked until 1807.
In 1792 Gröger was made an honorary member of the Gesellschaft zur Beförderung gemeinnütziger Tätigkeit in Lübeck.
After lithography developed in northern Germany, they both worked in this medium individually as well as jointly under the business name Firma Gröger & Aldenrath.