Avner Werner Less (18 December 1916 – 7 January 1987) was a German-born Israeli police officer, best known for interrogating former German SS officer Adolf Eichmann after he was captured by Mossad agents in Argentina and brought to Israel to stand trial.

After Israeli independence in 1948, he became head of the Import-Export Section of the Ministry of Industry and Trade, and was Deputy-Director of the Legal Department for price control in the Haifa district.

For nine months, Less served as Eichmann's interrogator, questioning him daily for a total of 275 hours.

While in Germany, a German nationalist newspaper demanded his arrest as an accessory to the abduction of Adolf Eichmann.

From 1976 to 1979, he worked at the Company for Bank Revisions in Basel, and in 1979, he was employed by Neutra Treuhand AG as internal controller.