Purpose: The purpose of the study was to compare returns of quoted sin and non-sin stocks at the Nairobi Securities Exchange. The major objective of the study was to establish whether stock returns of sin stocks outperform non sin stocks.Methodology: The study used explanatory research design with the population consisting of all firms listed in the NSE. The sample of the study consisted of the top 20 NSE firms. The study grouped 18 firms into the non-sin stock category and another 2 firms (BAT

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... ad EABL) into the sin stock category. Secondary data sources were used in gathering data for analysis which was done using the Statistical Package for Social Sciences (SPSS version 20) to generate the descriptive statistics and also to generate inferential results.Results: The study found out that sin stocks have higher capital gains, high expected return and dividends than in non-sin stocksUnique contribution to theory, practice and policy: The study recommended that Sin stocks have higher expected returns than comparable stocks; however, neglected they are by norm constrained investors. Therefore, investors should split their investment in sin stock and non-sin stocks.