Autism spectrum disorder (ASD) is a lifelong neurodevelopmental condition that is characterized by deficits in social communication and restricted and repetitive patterns of behaviors (American Psychiatric Association, 2013). ASD has become increasingly prevalent within the United States, with findings from the ADDM Network 2018 surveillance year indicating that 1 in 44 individuals have been diagnosed with the disorder (Maenner et al., 2021). In addition to experiencing these defining diagnostic criteria, individuals diagnosed with ASD are disproportionately impacted by co-occurring internalizing and externalizing psychiatric conditions, as ASD symptomatology has frequently been associated with poor life outcomes including social isolation (De-la-Iglesia & Olivar, 2015; Gadow & Garman, 2020; Han et al., 2019; Hedley et al., 2018; Smith & White, 2020), adverse life experiences (Chou et al., 2020; Hoch & Youssef, 2020) and death by suicide (Chou et al., 2020; Hedley et al., 2018; Hirvikoski et al., 2016). In comparison with a predominately neurotypical general population, the estimated lifetime prevalence of autistic individuals developing anxiety disorders and major depressive disorder are 42% and 37% respectively (Hollocks et al., 2019). It is possible that the etiologies of ASD and psychopathology overlap to an extent (Burns et al., 2019; Burrows et al., 2017; Van Heijst et al., 2020), as heightened levels of autistic traits have been positively correlated with depression (Geurts et al., 2016; Liew et al., 2015), disordered eating (Barnett et al., 2021; Carton & Smith, 2014; Vuillier et al., 2020), social anxiety (Freeth et al., 2013; Liew et al, 2015), psychosis (Foss-Feig et al., 2019; Kincaid et al., 2017; Sullivan et al., 2013; Zheng et al., 2021), and borderline personality disorder (Dell’Osso et al., 2018; Dell’Osso et al., 2021). Amongst the general population, women exhibit a substantially heightened lifetime incidence of developing psychopathology in comparison to men (Kuehner, 2017). However, the existing body of literature on sex-based differences in the incidence of psychopathology is rarely translated to the autistic community, where over 70% of individuals have been diagnosed with at least one co-occurring psychological disorder (Lai et al., 2014; Lai et al., 2019). In a similar vein, the autistic community is plagued by a large male diagnostic bias, further increasing the importance of examining sex-based differences in psychopathology amongst this population. As the reported prevalence of ASD continues to rise, approximately 4 males will receive a diagnosis for each affected female (Bargiela et al., 2016; Begeer et al., 2013; Cridland et al., 2014; Dworzynski et al., 2012; Maenner et al., 2021; Loomes et al., 2017; Ratto et al., 2018; Werling & Geschwind, 2013). When coupling this sex ratio with reported prevalence rates, it is plausible that reported number of autistic females overall increasing prevalence rate of ASD, has potentially rendered the established diagnostic prevalence of 1 in 252 females (CDC, 2012) outdated, which suggests that an unknown number of female cases of ASD are lost due to this clinical exaggeration (Loomes et al., 2017). Females with ASD tend to “disappear” within both parent-reported and clinician-reported measures, as they are more likely to receive their diagnosis at a later than average age (Bargiela et al., 2016; Begeer et al., 2013; Giarelli et al., 2010), be misdiagnosed (Mademtzi et al., 2018; Milner et al., 2019) or even avoid being diagnosed entirely due to their ability to compensate for any ASD-related difficulties (Attwood, 2007; Begeer et al., 2013; Dean et al., 2017; Lai et al., 2017; Milner et al., 2019). The phenomenon of deliberately masking autistic behaviors within social contexts, known as camouflaging, is a crucial focal point for the intersection of sex-based differences in autism and psychopathology, as this behavior has been found to exacerbate mental health difficulties amongst autistic women (Bernardin et al., 2021; Cook et al., 2021; Hull et al., 2021). This scoping review serves to integrate the literature on gender disparities in autism and the literature on psychiatric comorbidities by examining studies that specifically target female-specific differences in co-occurring mental health conditions. It is imperative to conduct a scoping review on this topic, as there has been limited research comparing sex-based differences in the rates of mental health conditions amongst the autistic population (Sedgewick et al., 2020). Sedgewick and colleagues (2020) examined this topic in a sample of 945 adults, yet the scope of these findings was limited by the study’s cross-sectional design and a reliance upon self-reported data. By synthesizing the available research on sex-based differences in the prevalence of mental health conditions amongst autistic individuals, we aim to determine which diagnoses are most prevalent amongst autistic females in order to develop treatments that specifically target this population.