The study on teacher characteristics and students achievement in social Studies in Nigeria is geared towards investigating and determining the relationship between teachers' characteristics and students achievement in social studies in Nigeria. The main purpose of the study is to determine if there is relationship between certain teacher characteristics and students achievement in social studies.The study is important because it will help teachers identify some variables that constitute teacher characteristics for effective students achievement. The methodology used is correlational study techniques.The principal instrument used is questionnaire and students social studies score.The population used was the entire senior secondary school SS1 in Aniocha North Local Government and the sample size was 400 sss1 students made up of 40 from each of the 10 schools sampled. Kendall tau's correlation coefficient was used in data analysis and findings were discussed. It was found that teacher characteristics have relationship with students achievement. The researcher also recommended that teachers diversify teaching strategies that will suit individual learners in the learning process and improve student's achievement in social studies in Aniocha North Local Governments Area of Delta State.