Taking an initial step to empirically investigate cultural conjecture about stay-at-home mothers' (SAHMs') and working mothers’ (WMs') rivalry, the purpose of this study was to identify the content of stereotypes held for these subgroups of mothers. Through open-ended responses from SAHMs, WMs, and a broad non-parent sample, 5,523 traits of SAHMs and WMs emerged. Following coding procedures used in previous stereotype research (Hummert, Garstka, Shaner, & Strahm, 1994; Ruble & Zhang, 2013), the authors grouped the traits into 28 SAHM and 21 WM stereotype categories. The SAHM stereotype categories align with traditional views of womanhood, feminism, and family structure and reveal positive evaluations of mothering ability. Examples of the SAHM stereotype categories include: “domestic,” “caregiver,” “family-oriented,” and “ideal mom.” The WM stereotype categories align with non-traditional views of womanhood, motherhood, and family structure and reveal negative evaluations of mothering ability. Examples of the WM stereotype categories include: “determined,” “independent,” “work-focused,” and “substandard mom”. SAHM and WM stereotypes provide evidence for both stagnant and progressing ideals of women such that SAHMs are perceived as feminine, heterosexual housewives who are solely competent at mothering and WMs are perceived as independent, strong women who lack maternal instincts. Building on social identity (Tajfel & Turner, 1986) and subsequent theorizing (Cuddy, Fiske, & Glick, 2007), these results lay groundwork for further assessment of these stereotypes, particularly their prevalence, valence, and links to specific family and intergroup communication practices.