The institution of marriage, which is a symbol of the sacred bond between husband and wife, imposes reciprocal obligations on both parties. One of the basic duties that is assigned to men is to provide financial assistance for their wives in the name of "alimony", and this obligation is explicitly stated in the Civil Code. However, the question of whether it is possible to stipulate a condition of exemption from alimony in the contract has led to different opinions. Some argue that such a condition is invalid, while others maintain the validity of such a condition. In order to investigate this issue, this research has dealt with the concept of "marital absence" in the legal systems of Iran and Egypt with a descriptive-analytical and comparative approach. The results of this study showed that the condition of unilateral exemption imposed by the husband is contrary to public order and moral norms and nullifies it. However, it does not invalidate the marriage contract, but if the condition of exemption is fulfilled with the agreement and consent of the wife, it is considered valid. Therefore, the present study, based on the researches conducted in this regard and the analysis of the articles of the Civil Code, concluded that the unilateral inclusion of the condition by the husband is invalid because it is against public order and good morals, but it does not invalidate the contract, but if it is done with the agreement of the spouses and the consent of the wife, it is correct. Therefore, the present study can serve as a basis for legal reforms related to alimony laws in Iran to pave the way for the legislator to revive this law and predict the laws related to it in Iranian law in order to help maintain public order.