The scarcity of research on EFL teachers' job satisfaction and motivation prompted this study which aimed at identifying the relationship between EFL teachers' motivation and job satisfaction. To achieve this goal, the researcher selected 250 EFL teachers randomly with different years of experience in Mashhad language institutions. To collect the required data, the researcher employed Teacher's Motivation Questionnaire (TMQ) to elicit sources of motivation of EFL teachers and Teachers' Job Satisfaction Questionnaire (TJSQ) to elicit the job satisfaction levels. The results revealed a significant positive relationship (r = 0.44, p < 0.01) between EFL teachers' motivation and job satisfaction in Mashhad language institutions.