: English is a second language in Nigeria because it is non-indigenous, it was introduced by British Colonialists and Missionaries into the country. The roles and functions English language has assumed since its introduction into the country are outlined. Since Nigeria functions in virtually all spheres of life in English language, a variety known, internationally acceptable and intelligible exists as the Standard Nigerian English. What is really of concern is the increasing deviations noticeable in the speech and writings of Nigerians from the grammar of English. The error laden English spoken by many people in the country may well be replacing the Standard Nigerian English if the situation is not checked. The root causes of the problem are pointed out recommendations are made towards curbing the negative trend.