I-Introduction and Rationale: Autism is one of the pervasive developmental disorders which constitute a group of developmental disorders of the brain characterized by qualitative impairments in verbal and non verbal communication, social interaction and social imagination with restricted range of interests and often stereotyped repetitive behaviors and mannerism. The assessment of auditory processing in autistic patients using techniques such as otoacoustic emission (OAE), auditory brainstem response (ABR), N100 and P300 still remains to be challenged. II-Aim of the work: to assess some of the phoniatric and audiologic results in autistic children. III-Subjects and Methods: Each subject in this study (25 autistic children and 25 age matched control group; age ranging from 4-9 years) was subjected to transient and distortion product otoacoustic emissions (OAE), auditory brainstem evoked response (ABR), P300 and N100. Our subjects were also subjected to communication assessment, Intelligent Quotient (I.Q.), Childhood Autism Rating Scale (C.A.R.S) and Sensory Integrative Dysfunction questionnaire. Comparison between the patient and control groups was performed. Correlations between each of these tests and the other tests were also performed. IV-Results: There was a significant difference between autistic and control groups as regards some of the ABR IPLs and amplitudes, P300 and N100 results. There was a correlation between ABR abnormalities with communication function and auditory sensory integration function. There was a significant correlation between N100 and verbal and non verbal communication abilities only. While there was also a significant correlation between P300 latency and amplitude and each of the following: I.Q., C.A.R.S., dynamic assessment of verbal and nonverbal communication, sample of communication function and means and sensory integration dysfunction. V-Conclusion: Autistic children presented with normal hearing sensitivity and cochlear function. ABR results revealed a delay in brainstem propagation. The auditory deficits were more consistently manifested in higher aspects of processings in terms of delayed N100 and P300 latency and small P300 amplitude. N100 is a correlate of the level of communication and language development rather than a marker of autism. P300 abnormalities affect verbal and nonverbal communication, mental development, autistic features and sensory integration function in autism. VI-Recommendations: ABR may be an important prognostic indicator and an objective tool to monitor the progress of auditory training programs. N100 can be used as a valuable tool to evaluate the prognosis of communication intervention programs. P300 can be used as a prognostic method to investigate differential responding to various interventions.