In the run up to the 1977 Spanish general election, various organisations carried out opinion polling to gauge voting intention in Spain during the term of the Constituent Cortes Generales. Results of such polls are displayed in this article. The date range for these opinion polls is to the day the election was held, on 15 June 1977.

Voting intention estimates refer mainly to a hypothetical Congress of Deputies election. Polls are listed in reverse chronological order, showing the most recent first and using the dates when the survey fieldwork was done, as opposed to the date of publication. Where the fieldwork dates are unknown, the date of publication is given instead. The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour. If a tie ensues, this is applied to the figures with the highest percentages. The "Lead" columns on the right shows the percentage-point difference between the parties with the highest percentages in a poll.

Electoral polling Nationwide polling Voting intention estimates The table below lists nationwide voting intention estimates. Refusals are generally excluded from the party vote percentages, while question wording and the treatment of "don't know" responses and those not intending to vote may vary between polling organisations. When available, seat projections determined by the polling organisations are displayed below (or in place of) the percentages in a smaller font; 176 seats were required for an absolute majority in the Congress of Deputies.

Polling firm/Commissioner Fieldwork date Sample size Turnout PNV ASD FDI ESB Lead 1977 general election 15 Jun 1977 78.8 34.4 29.3 9.3 8.3 4.5 2.8 2.3 1.6 0.8 0.7 0.7 0.6 0.3 0.2 5.1 ANA/Europa Press 14 Jun 1977 1,825 80 31.4 26.0 8.1 9.5 6.6 1.7 6.4 2.4 – – – – – – 5.4 ICSA–Gallup/Ya 14 Jun 1977 1,200 91.8 28.9 32.6 6.5 6.4 5.4 2.7 4.4 2.0 – 0.7 3.4 0.6 – – 3.7 Tecnia/Informaciones 11–12 Jun 1977 1,500 64.8 29.5 27.3 9.5 6.5 7.7 2.9 6.1 1.8 – 1.2 1.2 0.7 1.1 0.2 2.2 Alef/Cuadernos para el Diálogo 11 Jun 1977?? 33.7 20.0 10.8 11.3 8.0 – 11.4 – – – 3.0 1.8 – – 13.7 Sofemasa/El País 6–8 Jun 1977 15,875 91.7 34.0 27.0 8.1 9.2 5.4 1.5 2.6 1.0? 1.0 0.7 0.7?? 7.0 ANA/Europa Press 28 May–2 Jun 1977 5,100? 30.0 20.7 7.2 11.3 6.2 2.3 6.8 1.3 – 2.3 1.5 – 0.4 – 9.3 Metra Seis/La Vanguardia 28 May–1 Jun 1977 1,700 83.1 34.4 24.2 9.7 4.9 6.8 – 3.1 – – – – – – – 10.2 Metra Seis/Diario 16 28 May–1 Jun 1977 1,700 76.8 40.5 20.7 7.8 8.3 6.1 3.1 5.6 1.4 – – 3.5 – – – 19.8 Sofemasa/El País 18–19 May 1977 1,638 85.2 33.8 22.5 9.7 9.6 6.6 – 5.0 2.7 – 2.9 2.4 1.2 – – 11.3 Sofemasa/El País 4–5 May 1977 1,595 85.1 33.5 21.9 8.8 7.9 9.0 – 1.8 2.5 – 0.5 1.4 0.4 – – 11.6

Voting preferences The table below lists raw, unweighted voting preferences.

Polling firm/Commissioner Fieldwork date Sample size PNV ASD FDI Lead 1977 general election 15 Jun 1977 26.8 22.8 7.3 6.4 3.5 2.2 1.8 1.3 0.6 0.5 0.5 0.4 21.2 4.0 ICSA–Gallup/Ya 14 Jun 1977 1,200 23.5 26.5 5.3 5.2 4.4 2.2 3.6 1.7 – 0.6 2.8 0.5 16.1 2.5 3.0 Sofemasa/El País 6–8 Jun 1977 15,875 27.7 22.0 6.6 7.5 4.4 1.2 2.1 0.8 0.6 0.8 – 0.6 15.0 3.6 5.7 CIS 1 Jun 1977 27,260 12.9 12.6 4.3 4.1 2.7 1.8 2.4 0.8 0.4 – – – 36.5 6.3 0.3 Sofemasa/El País 18–19 May 1977 1,638 20.1 13.4 5.8 5.7 3.9 – 3.0 1.6 – 1.7 – 0.7 34.9 5.6 6.7 Consulta/Cambio 16 10 May 1977 1,569 8.0 10.0 4.0 5.0 – – 4.0 – – 4.0 – – 54.0 8.0 2.0 Sofemasa/El País 4–5 May 1977 1,595 19.0 12.4 5.0 4.5 5.1 – 1.0 1.4 – 0.3 – 0.2 38.8 4.5 6.6 Consulta/ABC 4 May 1977 1,506 14.0 14.0 4.0 6.0 – – 4.0 – – 4.0 2.0 1.0 43.0 Tie

Victory likelihood The table below lists opinion polling on the perceived likelihood of victory for each party in the event of a general election taking place.

Polling firm/Commissioner Fieldwork date Sample size FDI Other/None Lead Consulta/ABC 4 May 1977 1,506 36.0 14.0 1.0 4.0 1.0 3.0 5.0 36.0 22.0

Sub-national polling Basque Country Polling firm/Commissioner Fieldwork date Sample size Turnout PNV ESB Lead 1977 general election 15 Jun 1977 77.2 29.3 26.5 12.8 7.1 6.1 4.5 3.6 2.6 2.8 Sofemasa/El País 6–8 Jun 1977????????? –?

Catalonia Polling firm/Commissioner Fieldwork date Sample size Turnout Lead 1977 general election 15 Jun 1977 79.5 28.6 18.3 16.9 16.9 5.7 4.7 3.6 1.4 10.3 Tecnia/Informaciones 11–12 Jun 1977?? 25.6 12.7 14.3 14.8 – 3.7 – – 10.8 Sofemasa/El País 6–8 Jun 1977?????? –?? –? Tele eXprés 3 May 1977?? 20.0 10.0 25.0 35.0 – – 10.0 – 10.0

Leadership polling Preferred prime minister The table below lists opinion polling on leader preferences to become prime minister.

Polling firm/Commissioner Fieldwork date Sample size Other/None/Notcare Lead Metra Seis/Diario 16 28 May–1 Jun 1977 1,700 37.7 13.6 4.2 3.2 – 5.0 11.5 24.8 24.1 Sofemasa/El País 18–19 May 1977 1,638 37.0 19.0 7.0 7.0 – 9.0 21.0 18.0 Sofemasa/El País 4–5 May 1977 1,595 43.0 23.0 – – 5.0 – 29.0 20.0 Consulta/ABC 4 May 1977 1,506 29.0 10.0 5.0 3.0 – 3.0 13.0 37.0 19.0

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