The study focused on effect of admin internal control on performance in telecommunications industry in South South and South East Nigeria. The study employed a descriptive survey research design. Instrument adopted for the study is a structured questionnaire based on simple random sampling method. In addition, interview was also employed to serve as a compliment for the questionnaire. Reliability of the research instrument was tested using the Cronbach Alpha method which revealed that the instrument is reliable. The result of Durbin Watson revealed that the data is free from autocorrelation. Data analysis was done using both descriptive and inferential analysis technique. Descriptive statistics was used to give insight on the respondents profile while inferential statistics was used in the conducting of hypotheses. The five research questions for the study were analyzed using multiple regression model. The study shows that the five null hypotheses were rejected while the five alternative hypotheses were accepted (organization’s internal control environment (p=0.000<0.05, ?=0.890); risk assessment (p=0.000<0.05, ?=0.242); control activities (p=0.001<0.05, ?=0.092); information and communication (p=0.000<0.05, ?=0.115); monitoring (p=0.000<0.05, ?=0.307)). The study concluded that organization’s internal control environment, risk assessment, control activities, information and communication, and monitoring aid and has a positive influence on organizational performance.