This dataset comprises qualitative and quantitative data collected for a PhD study on intercultural communication competence (ICC) and Chinese language learning. The dataset includes anonymised interview transcriptions, classroom recording transcriptions, participant learning journals, class quizzes, and survey responses. These materials capture participants’ language development, intercultural reflections, and learning experiences throughout the course. The data were generated and analysed to explore the relationship between language learning, intercultural training, and the development of ICC among adult learners of Mandarin Chinese.