This paper examines the effects of a morphological awareness intervention on the word reading and spelling skills of Grades 4 to 6 children with dyslexia. Sixteen children in eastern Ontario, Canada, received 20 hours of morphologically oriented instruction spread over 6 weeks and eight served as controls, and all received a battery of reading and spelling tests before and after the intervention. Students were taught the nature of morphology and the types of morphemes, how words could be assembled from morphemes or deconstructed into morphemes to make meaning from print and access the correct pronunciation, and how to use morphology in reading and spelling words. Repeated measures analyses of variance and analyses of covariance indicated that the experimental group showed significantly larger gains than the control group on measures of morphological awareness, morphological decoding, morphological analysis, and morphological spelling. There were no significant effects on word reading (fluency and accuracy) or on standardized spelling measures.