The intense language contact between Spanish and Catalan in Catalonia has led to cross-linguistic influence at all linguistic levels, but its effect on the prosody of these languages has received little attention to date. Based on semi-spontaneous and read speech data from 31 Catalan–Spanish bilinguals, this book provides a comprehensive analysis of the intonation of Spanish and Catalan as spoken in Girona, with a focus on the speakers’ bilingualism. These contact varieties share numerous intonational properties, with differences mainly in the frequency of specific tunes in certain contexts. However, they also exhibit significant variation, often linked to extralinguistic factors such as the bilinguals’ language dominance. Overall, the intonation of these contact varieties results from substratum transfer and wholesale convergence between the prosodic systems of Spanish and Catalan. The book is particularly relevant to scholars researching prosody, language contact, variation, and multilingualism.