Among several reasons preventing the effective labour market integration of immigrant women, the motherhood penalty and unpaid care responsibilities stand out prominently. In line with this, the present scoping review shows how motherhood affects the labour market integration of immigrant women in Australia, Canada, the UK, and the USA. This review shows that parenthood exacerbates the gender pay gap and limits labour market access, favouring men with children over immigrant mothers. Moreover, the effect of the motherhood penalty might be moderated by the level of education, age of the children, and the country of origin/ethnicity of immigrants. In the four countries examined, labour market outcomes for immigrant women are particularly poor. Factors contributing to this include limited language proficiency, traditional gender norms that restrict the full-time employment of certain groups of immigrant women, and institutional barriers like work-permit processing delays. To address these challenges, Australia, Canada, the UK, and the USA have implemented various policies facilitating immigrant mothers’ workforce participation. These measures include language and legal-system education, subsidised childcare, and integration programmes for both mothers and children. Additionally, some programmes in Canada and the USA provide employment assistance and financial support for childcare, while Australia and the UK offer comprehensive integration and settlement services.