The Spanish champions are one of the few clubs in world soccer not to have a corporate logo on their shirts, instead displaying the name of the United Nations Children's Fund, for which they pay the organisation 1.5 million euros a year.
However, they last month agreed a record five-year sponsorship deal with Qatar Sports Investment worth 30 million euros a season and will have "Qatar Foundation" emblazoned on their shirt fronts from July 1.
"It has been decided that the Qatar Foundation logo will go on the front of the shirt, on the breast," Barca vice president Javier Faus said at a news conference.
"In the end, there will be only two words 'Qatar Foundation' in yellow," he added. "UNICEF will go on the back underneath the player's name."
Barca officials argued that the injection of funds at a delicate time for the club's finances was necessary to pay for the development of their sports teams.
"We continue to have significant structural problems, which we have been burdened with for some years, but which are our structural problems now and which we have to deal with," Faus said on Tuesday.
"We have solved some of them with the Qatar Foundation sponsorship deal but we still have many challenges ahead."
Faus said it was not clear whether the UNICEF logo would be allowed to appear on shirts worn in the Champions League, Europe's elite club competition.
"What we can guarantee is that every FC Barcelona shirt that is sold around the world will have the UNICEF logo on the back."
Qatar was chosen in December by football's governing body FIFA to host the World Cup in 2022, when it will become the first Arab country to stage the finals, and Barca coach Pep Guardiola was one of the ambassadors for the bid.
The sponsorship deal includes a commitment for the club to play one friendly per season and the Qatar Foundation will take part in joint projects with UNICEF and Barca's own foundation.
