罗加诺公约是在1925年10月5日至16日欧洲多国在瑞士罗加诺商议的七项协议，在同年12月1日于伦敦签署，隔年9月14日于日内瓦批准生效。一战中的欧洲协约国与中欧及东欧新兴国家尝试确认战后领土界线，并争取与战败的德国恢复正常关系。

1925年2月9日，德国外长古斯塔夫·施特雷泽曼为求改善与西方国家的关系，建议与她们确立根据1919年凡尔赛条约而定下的德国西部边界。因此，德国、英国与法国在该年之夏交换照会，开启协议之先声。

条约的主要签署国是德国、法国、比利时、英国与意大利—前三国保证互不侵犯，而后两国则为此作保；如果前三国任何一者攻击另一国，所有其他签署国有责任保护被攻击国家。

The Locarno Treaties were seven agreements negotiated at Locarno, Switzerland, on 5–16 October 1925 and formally signed in London on 1 December, in which the First World War Western European Allied powers and the new states of Central and Eastern Europe sought to secure the post-war territorial settlement, and return normalizing relations with defeated Germany (which was, by this time, the Weimar Republic). Ratifications for the Locarno treaties were exchanged in Geneva on 14 September 1926, and on the same day they became effective. The treaties were also registered in the League of Nations Treaty Series on the same day.