Abstract. The primary goal of this investigation was to examine the speech and language development of deaf children with cochlear implants who have additional impairments relative to that of their implanted peers without additional disabilities. A secondary goal was to address some limitations of previous investigations that have included multiple types of disabilities in their experimental groups by focusing on deaf children with cochlear implants who have a single additional impairment, mild cognitive delay. We retrospectively examined the speech and language development of 69 prelingually-deaf children. The experimental group consisted of 19 children with cognitive delays and no other disabilities. The control group consisted of 50 children who did not have cognitive delays or any other identified disability. The control group was stratified by primary communication mode: half used total communication and the other half used oral communication. Children were tested on a variety of standard speech and language measures and one test of auditory skill development at 6-month intervals. The results from each test were collapsed from blocks of two consecutive 6-month intervals to calculate group mean scores prior to implantation and at 1-year intervals postimplantation. The children with cognitive delays and those without such delays demonstrated significant improvement in their speech and language skills over time on every test administered. There was a trend for typically developing children to have better speech perception than children with cognitive delays, although these differences were not statistically significant. In contrast, typically developing children performed significantly better than those with cognitive delays on two of the three measures of receptive and expressive language. Finally, there was no significant difference between the groups of children on their parental reports of auditory skill development. The results suggest that deaf children with mild cognitive impairments benefit from cochlear implantation. Specifically, improvements are evident in their ability to perceive speech and their reception and use of language, although it may be reduced relative to their typically developing peers with cochlear implants, particularly in domains that require higher level skills such as sentence recognition and receptive and expressive language. These findings suggest that children with mild cognitive deficits be considered for cochlear implantation with less trepidation than has been the case in the past. Although their speech and language gains may be tempered by their cognitive abilities, these limitations do not appear to preclude benefit from stimulation from a cochlear implant on traditional measures of speech and language development.