In recent years, the line of research on the socio-pragmatic aspects of language and language use has been increasing very rigorously. In this regard, taboos as well as euphemisms, due to their significant role in impacting on the interactions among interlocutors, have been the subject of research in various societies and cultures from a vast variety of aspects. That being so, the present study was an attempt to explore the perceptions of Iranian adult speakers of linguistic taboos and euphemisms in Iranian society. To achieve this aim, a convenient sample of 48 Iranian adult speakers, 24 males and 24 females, from Shiraz, Iran was recruited to participate in the study. The researcher interviewed them one by one and audio recorded their answers for further analysis and to determine their perceptions of linguistic taboos and euphemisms in Iranian society. The findings indicated that: a. Most of the participants believed that sex is the most offensive topic in Iranian society; b. All of the participants believed that people should use euphemisms in their speech and should take after of their speech especially in formal situations; c. Most of the Iranian adult speakers believed that the most important factor which leads to the use of taboo words is anger; and d. Most of the participants, both male and female, said they do not discuss taboo topics in mixed-sex groups.