This book constitutes the refereed proceedings of the 22nd Principle and Practice of Data and Knowledge Acquisition Workshop, PKAW 2026, held in Guangzhou, China, during November 17-18, 2026.

The 8 full papers and 5 short papers included in this book were carefully reviewed and selected from 30 submissions. This volume PKAW has provided a forum for researchers to exchange ideas and discuss advances in knowledge acquisition, a fundamental area of Artificial Intelligence (AI). Its scope has evolved beyond traditional human-centered knowledge acquisition to encompass related areas such as knowledge engineering, knowledge management, machine learning, and data mining, reflecting the broader development of AI research.