Moving to a new country is often combined with issues such as stress and a sense of loss that affect the overall well-being of immigrants. Furthermore, immigrants have not yet developed strong attachments to the country and, more specifically, to the places in which they will settle. Researchers have already discussed the role of the built environment for well-being and the sense of belonging and attachment it can provide, specifically through public open spaces, such as parks, squares, etc. These problems are worldwide, and the World Health Organization (WHO) also recommends creating public places that improve human health, well-being, and social inclusion. Moreover, at local levels, designers and urbanists must understand how to evaluate the relationship between immigrants’ place attachment and public places in order to improve the design of these places. Consequently, this study reviewed methods used to understand the effects of public open spaces on immigrants’ attachment. A systematic quantitative literature review was conducted, and a total of 26 articles were extracted relating to immigrants’ place attachment and public open spaces. Research locations, participants’ nationalities, the types of public open spaces, the methods applied, and place attachment evaluations were retrieved from the articles and analysed. The results show that evaluating immigrants’ place attachment presents many challenges, and there is no consensus on what approaches are best practices. However, qualitative methods were most applied in human–environment interactions, and immigrants’ place attachments were primarily assessed based on their social bonds in public open spaces. To conclude, a framework was designed to understand how immigrants’ place attachment was evaluated in the reviewed literature, and the dimensions of place attachment were defined.