The use of herbal medicines and medicinal plants available in a locality in the treatment and control of human diseases, promotion of health and management of health conditions will continue to play a significant role in the healthcare system of the people, especially in developing countries. This cross-sectional study was carried out to assess the perception and knowledge of usage of herbal medicines among the residents of Port Harcourt, Nigeria. Multi-stage sampling technique was used for this study. The results indicated that out of the 273 questionnaires returned, 118 (44.9%) of the respondents were male while 144 (55.1%) were female. The average age of the respondents was 36±10 years. The prevalence of usage of herbal medicine from this study was 80.9%. The major source of information about herbal medicines was home (family and friends). The results also indicate that 180 (68.6%) of the respondents did not experience unpleasant effects such as headaches, vomiting, nausea and diarrhea, with the use of herbal medicines. Similarly, on the reasons for using herbal medicine, 134 (51.1%) of the respondents indicated that they used herbal