Aims: To investigate the frequency of urinary tract infections (UTI) in kidney transplant (KT) recipients occurring in the first post-transplant year, and the relationship between the frequency of UTI, immunosuppressive therapy (IT) and kidney graft function. Design: Historic (retrospective) cohort research. Patients and methods: 114 patients were enrolled into the study (60.5 % men, median age 52 years; interquartile range 45 - 58). Data were taken from medical records and statistically processed by the IBM® SPSS® Statistics 25.0 software, at statistical significance level of P < 0.05. Results: Within one year following the KT, a total of 170 UTI episodes was reported in 67 (58.8 %) patients, caused by 21 different agents. Asymptomatic bacteriuria (44.1 %) was noted as the most common clinical presentation, while the most frequently isolated cause of UTI in all clinical presentations was E. coli (38.9 %). In most cases, UTI occurred within the first 3 months after the KT (58.2 %), during the period in which the patients had a Foley catheter and/or JJ stent. UTI was significantly more common in women and in elderly persons, but it became less frequent over time (lower UTI frequency observed in more recent KT recipients), and the higher frequency of UTI was not associated with worse graft function observed at the end of the first post-transplant year. Patients on corticosteroids as part of their IT, had a significantly higher number of UTI episodes (P = 0.02) at the end of the first post-transplant year. Conclusion: More than half of the participants had some form of UTI with the most frequently isolated cause being E. coli. A higher UTI frequency was observed in women and the elderly who took more powerful IT (corticosteroids), and within the first 3 months following the KT. One year after the KT, worse graft function was not noted in participants with more frequent UTIs.