We performed a nationwide survey to define the different practices in managing febrile neutropenia in haematology units. A questionnaire was sent out to a named haematologist in each of 220 haematology units in the UK. Questions were asked regarding antibiotics of choice in managing febrile neutropenia and the use of antibiotic prophylaxis. Responses were received from 167 (76%) haematology units. Combination therapy with piperacillin-tazobactam and gentamicin is used first-line in febrile neutropenia by 72% of units. Piperacillin-tazobactam monotherapy is used first-line by 5% of units. When response to initial empirical therapy does not occur after 24-48 h, 32% of haematology units add a glycopeptide (vancomycin or teicoplanin) and 31% change to a carbapenem and a glycopeptide. Seventy-one percent of units use oral fluoroquinolone prophylaxis for all neutropenic patients. The antibiotic treatment of febrile neutropenia in haematology patients, and the use of antibiotic prophylaxis, vary significantly across the UK. This survey is the first to examine the prescribing of UK haematology units in this area, and could help in the formulation of practice guidelines.