HIAG (German: Hilfsgemeinschaft auf Gegenseitigkeit der Angehörigen der ehemaligen Waffen-SS, literally "Mutual aid association of former Waffen-SS members") was a lobby group and a denialist veterans' organisation founded by former high-ranking Waffen-SS personnel in West Germany in 1951. Its main objective was to achieve legal, economic and historical rehabilitation of the Waffen-SS.