This article deals with the issues to develop critical thinking in teaching a foreign language. It gives the experience of writing a textbook to study English for university students through critical thinking development. It shows the modern challenge to work with information, to select it, percept, analyze, assess, and judge. It considers critical thinking as an integral component of information literacy of the personality which we need to develop purposefully and systematically in the educational process. The authors come to a conclusion that it is possible to integrate effectively the purposes to develop critical thinking of the personality in particular and information literacy in general into the process of teaching a foreign language. It provides the proof that we can emphasize critical thinking development of the personality at English classes studying different lexical and grammatical topics. It also studies a step-by-step algorithm to develop the desired personality skills within several lexical topics, illustrating it with different types of exercises aimed to form the linguistic competence and information literacy of the student's personality. It uses the methods of theoretical and practical analyses of the problem to develop critical thinking in the educational process. The positive experience of introducing critical thinking into the English language learning proves the potential and prospect of such an integration.