The distribution of formant frequencies of vowels in one of the major Indian languages (Telugu) are investigated. Spectrographic analysis of 600 multi-syllabic words spoken by three male informants provide the basic data for this study. The results confirms the existence of eleven Telugu vowels. A comparative study of Telugu vowels with cardinal vowels and Bengali vowels are also presented Again, comparative degree of variation for different pairwise articulatory distinctive features are discussed Keywords: Formant frequencies; Spectrographic analysis; Cardinal vowel; Articulatory features; Vowel diagram.