The Farm Workers Union of Uppland (Swedish: Upplands lantarbetareförbund, abbreviated ULF) was a trade union for agricultural workers in Uppland, Sweden. ULF was founded on December 1, 1918. The union was active parallel to the Farm Workers Union of Sweden (SLF). In 1919, SLF and the Swedish Trade Union Confederation (LO) begin pressuring ULF to merge with SLF, which finally came about in 1930.