The Croatian football federation, who last week were fined 80,000 euros (£64,561) after their fans were found guilty of racially abusing Italy striker Mario Balotelli, were on Tuesday handed a 30,000 euros (£24,000) punishment for incidents during their match with Spain - including the display of racist banners.
Their Portuguese counterparts, meanwhile, were fined 7,000 euros (£5,600) for an attempted pitch invasion by a supporter in their quarter-final against the Czech Republic.
A UEFA statement said of Croatia's fine: "The sanction has been imposed for the setting off and throwing of fireworks and the improper conduct of supporters (display of inappropriate and racist banners) at the EURO 2012 Group C fixture against Spain in Gdansk on 18 June."
The statement continued: "The Portuguese football federation (FPF), meanwhile, has been fined 7,000 euros for the inappropriate behaviour of their supporters - attempted invasion of the field of play by a fan - at the quarter-final against the Czech Republic in Warsaw on 21 June."
Croatia were knocked out of the European Championship after finishing third in Group C while Portugal face Spain in the first semi-final on Wednesday night. Croatia's punishment last week was the first for a racially-aggravated offence at a tournament which has been marred by the problem.
According to official observers, Italy striker Balotelli was subjected to monkey chants by between 300 and 500 Croatia fans during the 1-1 Group B draw in Poznan. There were also accusations of a banana being thrown onto the pitch at the Municipal Stadium.
Tuesday's fines for the HNS and FPF come after UEFA earlier opened disciplinary proceedings against both the Spanish football federation and the Russian football union for the improper conduct of their supporters during group matches. The cases both relate to racist behaviour and racist chanting, European football's governing body announced.
The cases will be dealt with on Thursday.
Russia, who were knocked out at the group stage, have been punished three times already by UEFA for the improper behaviour of their fans during the tournament. UEFA have also punished several other countries for spectator-related incidents in Poland and Ukraine.