BARCELONA—Leaders of separatist parties that dominate the wealthy region of Catalonia reaffirmed their commitment Friday to hold a referendum on independence from Spain, despite a court injunction barring the vote.

Party leaders meeting with regional President Artur Mas decided to maintain the scheduled Nov. 9 date for the nonbinding referendum. “We are continuing, and we are doing it together,” said Mr. Mas, flanked by the pro-independence leaders after seven hours of meetings.

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