The need for sustainability has grown so much and it is now an integral part of business operations. Small and Medium Enterprises (SMEs) are key contributors to the development of economic activities, employment generation and GDP growth as well as supporting the local communities. Over the last few years, customers have increased their environmental and social awareness, which has led to SMEs being more sustainable with their products, waste management, energy consumption, sourcing and their packaging, as well as through social responsibility measures. The main aim of the present study is to analyse the impact of the sustainability practices on the satisfaction of the customers among SMEs in Mysore. This study is descriptive of nature and based on both primary and secondary data. A total of 200 respondents were randomly selected from the population using convenience sampling and a structured questionnaire was used to gather primary data. Secondary data were gathered from journals, books, websites and previous research studies on sustainability and customer satisfaction. The collected data were analyzed using statistical tools: percentage analysis and factor analysis. The results of the research showed that sustainability positively affect customer satisfaction, customer loyalty and business performance. The factor analysis led to four main dimensions of sustainability practices: Environmental Sustainability Practices, Social and Ethical Sustainability Practices, Operational Sustainability Practices, and organizational Sustainability Practices. Of these, environmental sustainability practices had the most impact on customer satisfaction. The study also highlighted SME challenges such as lack of financial resources, awareness and insufficient technological assistance to take action on sustainability. Based on the study, the authors have concluded that sustainability practices have a positive impact on customer trust, enhancing the competitive edge of SMEs and contributing to sustainable growth in the long term.