Here are some important phone numbers that one might need.

Medical emergencies: 061
General emergencies: 112
Fire service: 080
Guardia Urbana (Local Police): 092
National Police: 091
Police Station Ciutat Vella: 93 290 2849
Police Station Gracia (Nil Fabra 17): 93 237 3511
Hospital Clinic i Provencial: 93 227 5400
Hospital del Mar (close Barceloneta): 93 248 9011/10
Red Cross (Dos Maig, 301 Eixample): 93 507 2700
Dental emergencies: 93 415 9922
Resident information: 900 150 000
Catalans Tourist Information: 93 238 4000
City Information: 010
The city's main lost-and-found office: 93 402 3161
Duty free enquiries: 900 333 555
Lost and found objects: 010/93 223 40 12