Retschwil was a municipality in the district of Hochdorf, in the canton of Lucerne, Switzerland.

On 1 January 2009, Retschwil together with Gelfingen, Hämikon, Mosen, Müswangen, and Sulz joined Hitzkirch.

[1] On 21 May 2006 an attempt to merge the Hitzkirch and the surrounding 10 municipalities failed, when five of the eleven voted against the merger.

[2] A less ambitious merger was then proposed and accepted, with the municipalities of Gelfingen, Hämikon, Mosen, Müswangen, Retschwil and Sulz joining Hitzkirch.

[3] The merged municipality has an area of 24.62 km2 (9.51 sq mi)[4] Retschwil has a population (as of 2007[update]) of 174, of which 1.7% are foreign nationals.