To meet the above needs, new forming and solid-state joining technologies are being developed, along with an increasing knowledge of materials behavior, advanced material models, better accuracy, and efficient numerical techniques. This special issue collects papers that can enhance the understanding of material deformation processes, expand the area of lightweight material forming and multimaterial joining processes, development of corresponding modeling capabilities, and dissemination of R&D on forming and joining of new materials. Additionally, material deformation-based solid-state joining processes are addressed in this special issue. We are grateful to the Journal Leadership for recognizing the relevance and vitality of this research field and to the community for responding enthusiastically to our call for papers. As a result, this issue contains 15 papers with 12 papers on forming and 3 papers on deformation-based solid-state joining. Novel processes, such as double-sided incremental forming, incremental profile forming, laser-based sheet forming, and microblanking, have also found a home in this collection. We would like to thank the authors for submitting their work to this special issue, as well as the reviewers whose prompt responses enabled the publication of this special issue in a timely manner. It is the sincere hope of the Guest Editors that the readers find this collection of papers worthwhile in furthering their investigations of the many remaining unanswered questions in forming and deformation-based solid-state joining.