This thesis aims to explore the differences in emotional expression in bilinguals between their L1 and L2, while focusing on the emotion of sadness. Specifically, this thesis attempts to uncover the participants' language preferences for expressing emotions, the emotional impact and authenticity of emotion expression in L2, and the perceived strength of emotion words in both languages. The first part of the thesis focuses on the theoretical framework and includes information about bilingualism, emotions, emotion-laden words, and the role of language in emotion processing and expression. It also provides an overview of previous studies on bilingualism and emotional expression. The second part of the thesis presents the research conducted for this study. The data was first collected using a web questionnaire and then presented using tables and graphs. The findings of this research show that participants prefer to express negative emotions in L1. Additionally, participants find it easier to express negative emotions and discuss sad experiences in L2, and find L1 to be more emotionally charged. Furthermore, participants reported that the expression of sadness felt more personal and authentic in L1 and perceived the given emotion words as stronger in L1 than in L2.