This book constitutes the refereed proceedings of the First International Workshop on Language Models for Underserved Communities, LM4UC@AAAI 2026, held in Singapore, on January 27, 2026.

The 14 full papers and 5 short papers included in this volume were carefully reviewed and selected from 43 submissions. They are organized in topical sections as follows: Evaluation and Benchmarks; and Low-Resource Adaptation.