The topic of the study is the effects of mother tongue in the study of English language in secondary school in Enugu North Local Government Area of Enugu State. The aim is to know how the mother tongue affects the learning of English language in Secondary school especially in four selected schools in Enugu North Local Government Area of Enugu State. The targeted population for the study was 500 but collection was questionnaires. The questionnaires were distributed to the four schools selected in Enugu North Local Government Area of Enugu State. The data were analyzed using percentage. The following were the researchers findings. That  teachers of English language in Enugu North do not have teaching aids in their various school visited. That students are hardly fluent in English   language. That most of the English language teachers are not qualified that students are hardly buy books in English language. That most student are very poor in understanding some of the English language vocabularies. In view of the above, the researcher recommends that teachers should be made to make use of correct teaching method in teaching of English that  mother tongue should be restricted as stipulated by the national policy on education 4th edition. That student should be taught and made  to speak English language always. That teachers of the English language should be made to ensure that  at least every student is carried along in the classroom lesson. That qualified teachers should be employed.