The Boterwet was a Dutch law providing for the regulation of manufacturing and controlling the sale of butter.
It was first enacted in 1889, and was partly based upon the British Margarine Act 1887, which had in turn been based upon the Danish Margarine Law 1885. All were nominally aimed at preventing the adulteration of butter with margarine (and other foodstuffs), but had been the result of lobbying by the dairy farming industry, which had come to regard the newly invented oleomargarine as a threat to dairy farmers' livelihoods.
- Lampe, Markus; Sharp, Paul (July 2013). "Greasing the whheels of rural transformation? Margarine and the Compatition for the British Butter Market" (PDF). EHES Working Papers in Economic History (43). European Historical Economics Society. Cite journal requires
- Lintsen, Harry (1992). Geschiedenis van de techniek in Nederland: Techniek en modernisering, landbouw en voeding,. 2. Stichting Historie der Techniek.