This study was carried out in Yenagoa metropolis in Bayelsa State. The purpose of the study was to examine the impact of roadside markets on the environment, highlighting challenges and potentials solutions for sustainable development. Survey method was adopted, where a questionnaire was administered on 240 respondents selected through the random sampling technique. The questionnaire aims to illicit vital information regarding types and nature of waste generated, disposal technique and availability of disposal facilities; relationship between roadside markets and environmental degradation as well as sustainable practices in roadside market areas. Data collected were analyzed using descriptive analysis and results presented in tables, figures and percentages. Results showed that roadside markets significantly impacted environmental sustainability, contributing to waste management issues, pollution, degradation of natural resources as well as road congestion which hinder pedestrian and vehicular traffic. It is recommended that government should encourage environmental education and awareness programmes, provide sanitation facilities, waste management systems and enforce policies and regulations that enhances environmental sustainability.