Four referendums were held in Switzerland during 1903.[1] The first was held on 15 March on a federal law on tariffs, and was approved by 59.6% of voters.[1] The second, third and fourth were all held on 25 October concerning an amendment to the federal criminal law, a popular initiative on Swiss residents electing the National Council and an amendment to article 32bis of the constitution.[1] All three were rejected by voters.[1] 
  Background
 The referendums on tariffs and the federal criminal law were optional referendums,[1] which required only a majority of the public vote.[2] The referendum on the changes to National Council elections was popular initiative and the referendum on the constitutional amendment was a mandatory referendum,[1] both of 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] 
 Results
 Tariffs
   | Choice  |  Votes  |  %  | 
  | For |  332,001 |  59.6  | 
  | Against |  225,123 |  40.4  | 
  | Blank votes |  3,529 |  –  | 
  | Invalid votes |  2,216 |  –  | 
  | Total |  562,869 |  100  | 
  | Registered voters/turnout |  768,125 |  73.3  | 
  | Source: Nohlen & Stöver  | 
 Criminal law
   | Choice  |  Votes  |  %  | 
  | For |  117,694 |  30.8  | 
  | Against |  264,085 |  69.2  | 
  | Blank votes |  15,099 |  –  | 
  | Invalid votes |  12,007 |  –  | 
  | Total |  408,885 |  100  | 
  | Registered voters/turnout |  768,105 |  53.2  | 
  | Source: Nohlen & Stöver  | 
 National Council elections
   | Choice  |  Popular vote  |  Cantons  | 
  | Votes  |  %  |  Full  |  Half  |  Total  | 
  | For |  95,131 |  24.4 |  3 |  2 |  4  | 
  | Against |  295,085 |  75.6 |  16 |  4 |  18  | 
  | Blank votes |  13,460 |  – |  – |  – |  –  | 
  | Invalid votes |  5,363 |  – |  – |  – |  –  | 
  | Total |  409,039 |  100 |  19 |  6 |  22  | 
  | Registered voters/turnout |  768,105 |  53.3 |  – |  – |  –  | 
  | Source: Nohlen & Stöver  | 
 Amendment of article 32bis of the constitution
   | Choice  |  Popular vote  |  Cantons  | 
  | Votes  |  %  |  Full  |  Half  |  Total  | 
  | For |  156,777 |  40.7 |  4 |  0 |  4  | 
  | Against |  228,094 |  59.3 |  15 |  6 |  18  | 
  | Blank votes |  14,674 |  – |  – |  – |  –  | 
  | Invalid votes |  8,307 |  – |  – |  – |  –  | 
  | Total |  407,852 |  100 |  19 |  6 |  22  | 
  | Registered voters/turnout |  768,105 |  53.1 |  – |  – |  –  | 
  | Source: Nohlen & Stöver  | 
 References
   - ^ a b c d e f Nohlen, D & Stöver, P (2010) Elections in Europe: A data handbook, p1906 ISBN 9783832956097 
  - ^ a b c d Nohlen & Stöver, p1891