Julius Heffner was a German teacher and painter.
The son of the farmer Gustav Adolf Heffner and Theresia Seubert, he studied at the Baugewerkeschule Karlsruhe and, after graduating in 1899, worked as a trade teacher at the Gewerbeschule Freiburg from 1900 until his retirement in 1935.

As a painter, he was self-taught and mainly painted Black Forest landscapes. He was a member of the "Breisgauer Fünfer" artists' association founded in Freiburg in 1899 (together with Hermann Dischler, Fritz Reiss, Carl Schuster and Ludwig Zorn). From 1926, he was a member of the exhibition association "Die Schwarzwälder" and, during the National Socialist era, of the Reichskammer der bildenden Künste.

He was represented at the Great German Art Exhibition in Munich in 1940 with two oil paintings, of which the Reich leadership of the SS purchased Summer in the Black Forest for 1500 RM.