Spain / Next Spanish General Election
CIS
Voting intention · published 29 May 2026
- Country
- 🇪🇸 Spain
- Election
- Next Spanish General Election
- Polling institute
- CIS
- Published
- 29 May 2026
- Fieldwork
- 4 May 2026 – 18 May 2026
- Sample size
- 4,016
- Margin of error
- ±1.5 est. (Not published: estimated from sample size (95%, simple random sample))
- Methodology
- Not published
Results
CIS, 29 May 2026: Partido Socialista Obrero Español leads with 36.2%, 11.3 points ahead of Partido Popular.
- Partido Socialista Obrero Español36.2%−0.2 percentage points
- Partido Popular24.9%+1.3 percentage points
- Vox16.2%+1.5 percentage points
- Sumar5.7%−0.1 percentage points
- Esquerra Republicana de Catalunya2.6%−0.3 percentage points
- Podemos2.5%+0.3 percentage points
- Se Acabó La Fiesta2.4%+0.7 percentage points
- Euskal Herria Bildu0.9%−0.4 percentage points
- Junts per Catalunya0.8%±0.0 percentage points
- Bloque Nacionalista Galego0.7%−0.1 percentage points
- Partido Nacionalista Vasco0.5%−0.3 percentage points
- Canarian Coalition0.1%−0.1 percentage points
- Unión del Pueblo Navarro0.1%±0.0 percentage points
Change in percentage points vs. the previous poll by the same institute for this election.
How to read a poll
- Sample size is how many people were asked. More people means less random error, never none.
- ±3 is the margin of error: the real figure is likely within 3 points either way of the one shown.
- Two polls can differ because they were taken on different dates, with different methods and different samples.
- est. means the institute did not publish a margin of error, so it is estimated from the sample size.
- The average smooths this out: it combines recent polls, so one unusual poll cannot swing the picture.