Prioritization and acuity tools have been leveraged to facilitate targeted and efficient clinical pharmacist interventions. However, there is a lack of established pharmacy-specific acuity factors in the ambulatory hematology/oncology setting. Therefore, National Comprehensive Cancer Network's Pharmacy Directors Forum conducted a survey to establish consensus on acuity factors associated with hematology/oncology patients that are high priority for ambulatory clinical pharmacist review. A three-round electronic Delphi survey was conducted. During the first round, respondents were asked an open-ended question to suggest acuity factors based on their expert opinion. Respondents were then asked in the second round to agree or disagree with the compiled acuity factors, in which those with ≥75% agreement were included in the third round. The final consensus was defined as a mean score ≥3.33 on a modified 4-point Likert scale (4 = strongly agree, 1 = strongly disagree) during the third round. A total of 124 hematology/oncology clinical pharmacists completed the first round of the Delphi survey (invitation response rate, 36.7%), of which 103 completed the second round (response rate, 83.1%) and 84 the third round (response rate, 67.7%). A final consensus was achieved for 18 acuity factors. Acuity factors were identified in the following themes: antineoplastic regimen characteristics, drug interactions, organ dysfunction, pharmacogenomics, recent discharge, laboratory parameters, and treatment-related toxicities. This Delphi panel of 124 clinical pharmacists achieved consensus on 18 acuity factors that would identify a hematology/oncology patient as a high priority for ambulatory clinical pharmacist review. The research team envisions incorporating these acuity factors into a pharmacy-specific electronic scoring tool.