Barcelona's men clinched their first league title since 2019 on Sunday, while the women's side had already secured theirs a couple of weeks ago.
Players from both squads went on an open-bus parade through the Catalan capital, greeting fans who sang and waved flags while fireworks and confetti were set off.
The players from the men's team wore T-shirts with the words "La Liga is ours. The future too." The women carried the slogan "We play together, we win together."
"I've never experienced anything like this," defender Ronald Araujo said. "I hope to enjoy many more experiences like this."
Barcelona secured their 27th league title, and first after the departure of Lionel Messi in 2021, with four rounds still to be played. The club also won the Spanish Super Cup this year.
Barcelona's women's team won their eighth league title, also with four games to spare. They will play in the Women's Champions League final against Wolfsburg in June.