In order to increase organizations' productivity, managers focus on employees' creativity in setting and achieving forward-looking goals. This approach is known "Management by objectives" (MBO), which requires every department manager to set specific measurable goals with each employee and discuss the result toward the previously set goals. On the other hand, every employee has a unique personality that differentiates him from others. Hence, understanding the employee personality gives clues about how he acts and feels in various situations. Therefore, to manage people effectively, it is helpful to understand their different personalities for placing them into their suitable jobs and to understand how they can set their specific goals. This research aims at investigating the influences of personality types on MBO in the hotels industry. A survey method was used to collect practical data from 229 employees in 31 five star hotels in Greater Cairo; the obtained data was analyzed statistically. The research revealed that there are two personality types had positive influences on MBO dimensions. The research recommends that hotels should study employees' personality types to be able to create teams of  personality types that can positively influence MBO.