Ten critically ill patients with either bacteremia or ventilator-associated pneumonia caused by carbapenem-resistant Acinetobacter baumannii, Stenotrophomonas maltophilia, or New Delhi metallo-β-lactamase–producing Klebsiella pneumoniae received cefiderocol. All strains had minimum inhibitory concentration ≤2 μg/mL. Thirty-day clinical success and survival rates were 70% and 90%, respectively. Two patients had a microbiological failure. Future prospective studies are warranted.