In the 20 years since they were launched, the Guiding Principles on Internal Displacement have been of assistance to many States responding to internal displacement, and have been incorporated into many national and regional policies and laws. However, the scale of internal displacement today remains vast, and the impact on those who are displaced is immense. This issue includes 19 articles on the main feature theme of Twenty Years of the Guiding Principles on Internal Displacement. See more at: www.fmreview.org/GuidingPrinciples20