The study assessed the relationship between social media utilization and academic achievement of undergraduate students in northwestern Nigeria. The study had nine specific objectives, nine research questions, and five null hypotheses which were formulated and tested at 0.05 level of significance. A correlation type of descriptive research design was adopted for this study. The population of the study was 9752 of 200 level students who were in 2016/2017 academic session in five federal universities in North West, Nigeria. Two hundred and seventy two students constituted the sample size for the study using simple random sampling technique. The instruments used to generate data for the study was a researcher-constructed social media utilization questionnaire (SMUQ). The drafted questionnaire was validated by the two researchers' supervisors and two experts in research and methodology ,pilot tested at E with an estimated reliability of 0.78 which was obtained using Cronbach Alpha Correlation Coefficient Formula. Mean and standard deviations were used to answer the research questions. Pearson Product Moment Correlation (PPMC) was used to test null hypotheses one to four, and t-test statistic was employed in testing null hypothesis five. The findings of the study showed that there was no significance relationship between social media utilization and the rate of usage of social networks and undergraduate students academic achievement in northwestern universities in Nigeria and gender showned asignificant difference in the opinion of male and female students in the use of social media .Based on the findings, it was concluded among others that, social media utilization, and the rate of usage had no significance relationship with undergraduate students' academic achievement in North western Nigeria. One among the recommendations given was that Teachers should endeavor to ensure that they incorporate the use of social networks' in teaching and learning process so as avoid the menace of the negative influence of these sites on students' achievement.