This study aimes to investigate the impact of gender diversity in the board of directors (female board memebership) on accounting conservatism, Since researchs indicate that male and female hold different attitudes towards cods of ethics (Ibrahim and Angelidies, 2009; Ho, 2015: 356), They found that females adopt strict ethical stance than males in work-place (Females are more ethicaly sensitive). Females culture and ethical characteristics have been found to be less (assertive, aggressive and overconfident) and more (anxious, risk-averse and ethical sensitive). The study contributes to accounting cultural and ethical literature by linking the conservative and ethical inclinations of females (focuse on female board membership) to accounting conservatism. Therefor, the study depends on Gray’s (1988) framework which links culture values or dimensions (which includes macsculiniy versus femininity) with accounting system (which includes accounting conservatism). Using a sample of 221 firm on the Egyption listed companies for the period 2015-2018, after excluding firms with missing values to become 119 firm with 476 observations, (Givoly and Hayn, 2000) model to measure accounting conservatism and measuring female board membership as a dummy variable equal (1) if there is female in board and (0) atherwise. However the finding of the impirical analysis indicate that the femles board membership has a negative impact on accounting conservatism.