German submarine U-4706 was a Type XXIII U-boat of Nazi Germany's Kriegsmarine during World War II.

She was ordered on 7 July 1944, and was laid down on 14 November 1944 at Friedrich Krupp Germaniawerft AG, Kiel, as yard number 948.

She was launched on 19 January 1945 and commissioned under the command of Oberleutnant zur See Manfred Schneider on 7 February 1945.

[2] In October 1948, U-4706 was transferred to Norway, and the Royal Norwegian Navy quickly gave her the impromptu name HNoMS Knerten ("the runt") in reference to her diminutive size relative to the three Type VIIC/41 boats that were acquired at the same time.

Knerten was briefly homeported in Trondheim in 1949, slated to be used as a development testbed for air-independent propulsion technology, but a lack of spare parts and a battery explosion accident prevented her from ever being entered into service.