For the tertiary health care system to provide adequate care during disasters, willing and able healthcare providers must be available to respond to the abnormal surge of the patients. Health care professionals (HCPs) constantly face a dilemma because of their profession to either respond to disasters or protect themselves. This study was conducted to assess the willingness and ability of HCPs working in the tertiary healthcare system of Khyber Pakhtunkhwa to respond to disasters. This cross-sectional survey was conducted in all the 8 tertiary care hospitals of the Khyber Pakhtunkhwa province of Pakistan. For different disaster scenarios, between 6% and 47% of HCP indicated their unwillingness, and between 3% & 41% of HCPs indicated that they were unable to respond to the given disaster scenarios. HCPs with childcare obligation indicated significantly lower willingness (p<0.05) to respond to earthquakes, MCIs, and an outbreak of Influenza, and SARS. Male HCPs showed a significantly (p<0.05) higher willingness to respond to earthquakes, MCIs, and an outbreak of Influenza as compared to their female counterparts. The overall ability indicated by HCPs for various disaster scenarios ranged between 54.1% [95% CI 0.503,0.578] for responding to victims of nuclear war and 96.4% [95% CI 0.947,0.976] for responding to conventional war. The HCPs who indicated childcare obligation showed a significantly lower ability (p<0.05) to respond to environmental disaster, influenza outbreak, and responding to victims of nuclear war. Female HCPs indicated significantly higher ability (p<0.05) as compared to their male counterparts. This survey provides an opportunity for the tertiary healthcare system to build on the findings and develop disaster mitigation plans to address the barriers to improving the HCPs’ availability during disasters.