Five referendums were held in Switzerland during 1929.^[1] The first three were held on 3 March on the issues of grain supply (a proposal and counter-proposal) and a federal law on tariffs.^[1] The counter-proposal to the grain supply question and the tariffs law were both approved.^[1] The fourth and fifth referendums were held on 12 May on popular initiatives on road traffic and banning spirits.^[1] Both were rejected by voters.^[1]

The grain supply, road traffic and spirits referendums were popular initiatives,^[1] which required a double majority; a majority of the popular vote and majority of the cantons.^[2] The decision of each canton was based on the vote in that canton.^[2] Full cantons counted as one vote, whilst half cantons counted as half.^[2] The tariffs law question was an optional referendum,^[1] requiring only a majority of voters in favour.^[2]