Background and purpose: Pseudomonas aeruginosa is a significant contributor to hospital-acquired infections, including urinary infections, bacteremia, pneumonia, and burn wound infections. Due to the significant role of carbapenems in treating infections that are resistant to conventional antibiotics, it is necessary to identify the prevalence and resistance patterns of pathogens that cause hospital infections. This will help to prevent the spread of microbial resistance, and subsequently, reduce the death rate caused by such infections. Therefore, the aim of the present study is to determine the occurrence of metallo-beta-lactamase genes in Pseudomonas aeruginosa isolates in Sari hospitals.