This research attempted to investigate the effect that teaching English language culture has on Algerian EFL (English as a Foreign Language) learners' sociocultural competence. It also aimed at showing that having no exposure to English language culture alongside learning the English language itself will affect learners' understanding and production of the language. In this light, the study attempts to answer the following questions: to what extent is the culture of the English language present in the lessons of English language that are introduced to secondary school students? What cultural background do secondary school students have about the English language? And if they do have any cultural background, what is the source of that background and whether culture teaching enhances EFL learners' socio-cultural competence? We hypothesised that teaching culture to Algerian EFL learners will increase their sociocultural competence and improve their understanding of the language. This hypothesis was tested through conducting a quasi-experimental study with a group of eighteen students from Habba Abd El-Madjid Secondary School in El-Meghaier, El-Oued (Algeria) The final results revealed a remarkable improvement among the majority of students concerning their sociocultural competence and their perception and understanding of authentic English language. Therefore, it is recommended that the element of culture should be integrated into English language curricula of Algerian schools and that, if done, it will take students' level one step further towards a better acquisition of English language.