This book constitutes the thoroughly refereed post-workshop proceedings of the 10th International Workshop on Information Hiding, IH 2008, held in Santa Barbara, CA, USA, in May 2008. The 25 revised full papers presented were carefully reviewed and selected from 64 submissions. The papers are organized in topical sections on anonymity and privacy, steganography, forensics, novel technologies and applications, watermarking, steganalysis, other hiding domains, network security, and fingerprinting.