Holding aloft a giant banner with the Spanish and Catalan flags, the pro-unity demonstrators flooded Catalonia square in Barcelona, the northeastern region's capital, a month after Catalan separatists formed a massive human chain to call for Catalonia's independence.
"The silent majority has broken its silence. The pro-independence human chain is not the only image of Catalonia," said rally organiser Alicia Sanchez-Camacho.
City officials said 30,000 people demonstrated, while organisers put the number at 160,000.
Catalonia has vowed to press ahead with plans to hold a self-determination referendum.
But the government of Prime Minister Mariano Rajoy has insisted that a referendum in Catalonia, a wealthy region home to about 7.5 million of Spain's 47 million people, would be unconstitutional.
Spain's national day commemorates the anniversary of Christopher Columbus's first arrival in the Americas on October 12, 1492.
Crown Prince Felipe presided over the ceremonies for the first time, as Spain's 75-year-old King Juan Carlos was recovering from a hip operation after leaving hospital on October 1.
Felipe presided over a military parade in Madrid, dressed in military uniform and accompanied by his wife Letizia as they briefly met with troops from the Royal Guard.
The parade lasted barely an hour and was a toned-down affair, in line with crisis-hit Spain's austerity regime.
The budget for the event has been cut by another 15 per cent from last year and is now at 823,000 euros (USD 1.1 million), down from 2.8 million euros in 2011.
His image has suffered, however, in particular because of a corruption scandal implicating his youngest daughter Cristina, who was not present at the parade.
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