This study aimed to investigate the prevalence of undernutrition in children with cerebral palsy (CP) and to determine the relation with feeding ability. Ninety children with CP from special needs schools were examined. Undernutrition was diagnosed on one or more of the following criteria: weight <2nd centile, triceps or subscapular skinfold measurement <3rd centile, mid-arm circumference <5th centile. Feeding competence was scored with respect to seven specific oromotor tasks using the Multidisciplinary Feeding Profile. Thirty-six participants (40%) had diplegia, 29 (33%) quadriplegia, 13 (14%) hemiplegia, and 12 participants (13%) had dyskinetic CP. Age ranged from 2.6 to 18.7 years (mean 10.8 years). Forty-six percent (41 of 90) were undernourished. In all aspects of feeding, those undernourished had lower feeding competence scores compared to adequately nourished children (p<0.002). Each modality of feeding competence correlated significantly to the centiles of weight, triceps or subscapular skinfold measurement and mid-arm circumference (p<0.02). A positive association of weight, triceps skinfold measurement, and mid-arm circumference with chewing ability was present independent of other feeding modalities (p<0.05). Undernutrition was common in this group and was associated with poorer feeding ability.