King Felipe has presided over several high-profile events in Catalonia in recent days, amid ongoing separatist rumblings there.
His Majesty helped launch the large GSMA Mobile World Congress 2015 with a dinner at Pedralbes Palace, once an official residence for the Spanish Royal Family.
He then toured the exhibits at the Fira De Barcelona venue along with national and regional leaders.
The King coincided with Catalonian President Artur Mas, who recently scheduled elections for later this year as a referendum on independence.
Separately this week, King Felipe welcomed Renault-Nissan Alliance CEO Carlos Ghosn at Albéniz also in Barcelona.
In Madrid this week, part of a busy few days for the Royal Family, King Felipe and Queen Letizia welcomed Colombian President Juan Manuel Santos.
As is customary, Their Majesties welcomed the President and his wife during an official ceremony at El Pardo Palace, then a meeting at Zarzuela Palace and then a gathering at the Madrid Royal Palace.