Police in Spain said around a thousand people demonstrated in Barcelona against the COVID-19 health pass in Catalonia.
Demonstrators held a banner reading the health passport equalled a totalitarian state. Others compared the health pass to a dictatorship.
It was the second consecutive week that the protesters met.
Pandemic restrictions are normally imposed at the regional level in Spain and the country reached more than 90% vaccination uptake in the population aged 12 and up without imposing a health pass.
But more and more regions are considering it amid a new wave of COVID-19, with a large increase over the last two weeks.