Following constant complains by our schools on short falls in the supply of laboratory apparatus and even when available they are sub – standard, this study was conducted to determine the re-training needs of mechanical engineering technologists who are directly involved in the production of these laboratory apparatus for improved performance in Scientific Equipment Development Institutes (SEDI) in Nigeria. Two research questions and 2 hypotheses were formulated to guide the study. The study was conducted in the two Scientific Development Institutes located at Minna and Enugu. A survey research design approach was adopted. The entire population of 82 mechanical engineers and 140 mechanical engineering technologists served as the respondents. No sampling was done. A 50 item structured questionnaire was used to collect the relevant data for the study. Data collected were analyzed using frequency counts, standard deviation, mean and t – test statistics. Results from analysis of data showed that all the 50 proposed items were accepted as retraining needs of mechanical engineering technologists. Specifically, the study revealed that the technologists were most deficient in areas of the use of automatic, NC, and CNC machines. It was recommended that as a matter of urgency government should put in place various strategies of retraining such as partnership with production industries, workshops, seminars and short term trainings outside the country. Key words: Re-training, performance, technologists, industries, scientific equipmen