This volume features the latest advancements in Spanish sociolinguistics, drawing from the 10th Workshop on Spanish Sociolinguistics (WSS10). Organized into three sections, its nine chapters explore crucial issues in bilingualism and sociolinguistic variation (morpho-syntactic, phonetic, phonological and lexical/pragmatic) within the Spanish-speaking world, across diverse geographical areas such as Arizona, New York City, Puerto Rico, Galicia, Melilla, Catalonia, Philadelphia, Colombia, and Argentina. The collection highlights the dynamic evolution of 21st-century sociolinguistic methodologies, from traditional sociolinguistic interviews and oral corpora to innovative approaches like social media analysis, cutting-edge computational methods, and natural language processing. The volume not only commemorates the achievements in the field since the inaugural 2002 Workshop but also provides accessible insights into the most current developments and techniques, making it an essential resource for advanced undergraduate and graduate students, linguists, social scientists, and anyone seeking a deeper understanding of the evolving landscape of Spanish sociolinguistics today.