Wikipedia:Selected anniversaries/October 23
- 1641 – Irish Catholic gentry in Ulster tried to seize control of Dublin Castle, the seat of English rule in Ireland, to force concessions to Catholics.
- 1850 – The first National Women's Rights Convention, presided over by Paulina Kellogg Wright Davis (pictured), began in Worcester, Massachusetts.
- 1942 – World War II: Japanese forces began their ill-fated attempt to recapture Henderson Field in Solomon Islands from the Americans.
- 1956 – The Hungarian Revolution began as a peaceful student demonstration that attracted thousands as it marched through central Budapest to the parliament building.
- 1982 – An attempt to arrest members of a cult in Miracle Valley, Arizona, led to a shootout in which two church members were killed and seven police officers were injured.