The aim of this study is to compare public opinion regarding single and same-sex parents. Background: Comparing attitudes about the effectiveness of single-parents to same-sex parents shows how much importance the public places on the number of parents compared to the sex of the parents; however, surprisingly little research examines attitudes about single and samesex parenting ability. Method: We use data from the 2012 General Social Survey "Family-and-Changing-Gender-Roles" module (N $ 1200) to compare perceptions of the effectiveness of single parents (vs. two parents) and same-sex parents (vs. a mother and a father). We construct a measure that captures whether individuals hold more positive attitudes about single parents or same-sex parents. We then rely on multivariate models to examine the impact of sociodemographic characteristics on these perceptions, and explore the influence of attitudes regarding gender, sexuality, and childcare policy.Results: Approximately half of the respondents provided similarly positive or negative responses regarding the effectiveness of single and same-sex parents; of the remaining half, slightly more provided higher ratings to single parents. Several sociodemographic factors-gender, age, marital status, region, and sexual minority statussignificantly shape attitudes about same-sex and single parents in similar directions-although, in some cases, these factors also predict differences in these attitudes. For example, compared to men, women are more positive about both single parents and same-sex parents, but they still rate single parents higher. In contrast, other sociodemographic factors-notably, race/ethnicity and education-predict attitudes about same-sex and single parents, as well as the difference between these two parental types. Some of these patterns occur via respondents' religiosity. Of the attitudinal factors, attitudes regarding