Limited data are available on intensive care unit (ICU) admissions for adults receiving kidney replacement therapy (KRT - dialysis or transplantation) in Australia. Our aim is to characterise admissions for patients receiving long-term dialysis and kidney transplant recipients relative to the general intensive care population in Australia.Retrospective registry-based data linkage cohort study.All ICUs in Australia that reported to the Australian and New Zealand Intensive Care Society Adult Patient Database, 1 January 2018-31 December 2020.All admissions were included. Data were deterministically linked to the Australia and New Zealand Dialysis and Transplant (ANZDATA) Registry. Subgroups analysed were defined by sex, age, admission type, APACHE III-j diagnostic category, diabetes status, body mass index (BMI), dialysis modality, dialysis vintage, and kidney transplant vintage.Admission to ICU for patients receiving KRT at the time of admission (as reported to the ANZDATA Registry).Patients receiving long-term dialysis prior to admission and those with a kidney transplant numbered 2826 (0.6% of all admissions) and 1194 (0.3%), respectively. Age-sex standardised admission rates relative to the non-KRT cohort (n = 438,271 or 99.1%) were highest for long-term dialysis patients (relative rate 10.18 [95% CI: 9.46,10.93]) and associated with diabetes and sepsis, cardiovascular and respiratory diagnoses.Rates of ICU admission for people receiving long-term dialysis or kidney transplantation were many times higher than the general population, with particularly increased relative risk among younger age groups and for key medical diagnoses. Given the burden on patients and health services, exploration of strategies to reduce this risk is important.