Background and Objectives: Bone marrow transplant patients often rely on catheters for various medical procedures, including the administration of medications and blood draws. However, catheters can sometimes lead to complications and infections, significantly affecting a patient's overall health and recovery. The purpose of this study was to investigate common catheter infections in bone marrow transplant patients at Baqai 2 Hospital of Ahvaz.Subjects and Methods This retrospective study included all patients (children/adults) undergoing bone marrow transplants at Bagai 2 Hospital of Ahvaz from 2021 to 2022. Catheter culture results, including bacterial isolation using standard microbiological methods (culture on BA medium, nutrient agar medium, and Cetrimide agar base), were recorded on a researcher-developed checklist. The data were subsequently analyzed using SPSS software, and the rate of catheter infection, as well as other associated factors, were investigated using the chi-square statistical test.Results A total of 138 transplant patients were included in the study, with ages spanning 4 to 69 years. The average length of hospital stay for these patients over the two years was 23.04 days. Patient diagnoses varied, with Hodgkin's disease and multiple myeloma each accounting for 23.08% of cases. AML and neuroblastoma each represented 15.38%, while ALL, PCSNSL, and thalassemia major each made up 7.7% of the cohort. Regarding catheter cultures, there were no positive cultures in 2021. However, in 2022, the prevalence of positive cultures was 8.30% (0.002%-38.47%), which was specifically identified in a 52-year-old patient with diabetes.Conclusion Underlying disease in bone marrow transplant patients can play an important role in catheter infections.