This study investigated the relationship between staff development strategies and organizational performance. The independent variable, Staff development had as its dimension, coaching and mentoring, while the dependent variable organizational performance was measured using growth. The study adopted the cross sectional survey method of the quasi experimental research design. The study has a population of 1350 staff of NAOC studied, a sample of 271 from the population was taken using the Krejcie and Morgan sample size determination table. The questionnaire was the main instrument used to gather primary data, the instrument was subject to face and content validity, a pilot study was also carried out to ensure the instrument measures what it sets out to measure. A reliability of the instrument was also done using the Cronbach alpha test. The Spearman’s Rank Order Correlation Coefficient was used to test the hypotheses, while the partial correlation was used to check the effect of the moderating variable on the dependent and independent variable. Our findings revealed a significant relationship between the dimensions of our independent variable staff development strategies given as coaching and mentoring, and the measures of the dependent variable given as growth. It also concluded that coaching and mentoring play significant roles in building effective organizations. The study recommended that organizational practices be streamlined to increase coaching and mentoring by assigning or encouraging leaders to adopt subordinates and assign higher responsibilities aimed at seeing them develop.