Recent literacy research shows an increasing interest in the influence of prosody on literacy acquisition. The current study examines the relationship of nonspeech rhythmic skills to children's reading acquisition, and their possible relation to stress assignment in Spanish, a syllable-timed language. Sixty-six third graders with no reading difficulties were scored on measures of nonspeech rhythm, word-level decoding skill, reading fluency and reading with correct assignment of lexical stress. After controlling for verbal intelligence and working memory, hierarchical multiple regression analyses showed that nonspeech rhythm predicted unique variance in reading fluency and correct stress assignment; it did not predict decoding skills. Given that Spanish is a syllable-timed as opposed to stress-timed language like English, the association between nonspeech rhythm, reading fluency and stress assignment found in our study suggests that nonspeech rhythm may be a universal factor in reading acquisition, independent of the type of linguistic rhythm.