All the three fatalities took place in Haridwar, an official release said here today.
A total of 352 cases of dengue and 648 of malaria have surfaced across the hill state this year, it said.
Of the 352 persons afflicted with dengue in the state, three have succumbed to the disease, the release said.
Health minister S S Negi held a meeting with officials here and asked them to take urgent steps to check spread of the vector-borne diseases.