The use of outcome measures for assessing progress in the management and treatment of cerebral palsy (CP) is widely recommended. This study was, therefore, carried out to determine awareness and use of standardized outcome measures among physiotherapists managing CP in Nigeria. Barriers to and facilitators for the use of outcome measures were also investigated. This was a descriptive study involving 138 physiotherapists from selected hospitals in southwestern Nigeria. A self-administered questionnaire was used to obtain relevant information on socio-demographics, awareness, use, barriers to, and facilitators for the use of seven standardized outcome measures. The Gross Motor Function Measure was the most recognized (78.9%) and commonly used (58%) outcome measure, while the Paediatric Outcomes Data Collection Instrument (23.2%) and the Paediatric Evaluation of Disability Inventory (10.9%) were the least recognized and least used, respectively. The greatest perceived facilitators were familiarity (87.7%), positive attitude (87.7%), and that outcome measures allow for a balanced clinical assessment (89.1%). The greatest perceived barriers identified were the need for extra accommodation to apply outcome measures (63%) and time consumption on the part of patients (44.2%). Many physiotherapists in this study identified the standardized outcome measures, but fewer used them irrespective of educational status and years of work experience. Generally, there was a positive attitude toward the use of outcome measures. The use of outcome measures should be promoted among physiotherapists in Nigeria, through training programs and translation into the native languages, to effectively assess, manage, and monitor the progress of patients with CP, putting into consideration barriers and facilitators.