The high scientific standards maintained by H2Open Journal, in their papers owe much to the continuing dedication of the journals’ reviewers, who give freely of their time and expertise. IWA Publishing is pleased to pay tribute to this contribution by recognizing those who have participated in the review process. Thus, the Editor in Chief, Editors and Associate Editors acknowledge with particular gratitude the following reviewers who have reviewed papers during the period January 2022–December 2022.