The present study is devoted to investigation on English and Tatar infinitive. The study is significant due to the fact that the interest to contrastive-comparative study of languages has amplified. It is caused by aspiration to reveal common features and tendencies, characteristics, uniqueness and originality of each language. The present study aims to investigate and identify similarities and differences between infinitives in both languages in terms of morphological and syntactical structures. The study is descriptive, contrastive and comparative. It compares, contrasts, and describes grammatical structures of English and Tatar Infinitives. The results of the study can be used in pedagogical grammar, and at the same time, in developing materials for EFL learners, integrating L1 grammar into teaching L2, which can be a facilitative factor to raise the learners' awareness.