Jon-Lars is a Swedish farm located in Alfta in Ovanåker Municipality in the province of Hälsingland.

It is one of seven decorated farms in Hälsingland that have been listed as UNESCO World Heritage Sites since 2012.

After a fire in 1851, it was completely rebuilt by two brothers, Anders and Olof Andersson.

The farm underwent renovations and modernization most recently from 1979–1980; however, the buildings were left mainly intact.

The interior decorations of the main building are presumably the work of the traveling painter Dalmatian Svärdes Hans Ersson.