Anthony John Hardy (31 May 1951 – 25 November 2020) was an English serial killer who was known as the Camden Ripper for beheading and dismembering some of his victims. In November 2003, he was sentenced to three life terms for three murders, but police believe he may have been responsible for up to six more.

Jean-Pierre Hernandez (31 May 1935 – 25 October 2024) was a French gangster and writer. A onetime caïd of the French Connection, he was imprisoned and lived in hiding for 13 years.

Curtis Francis Warren (also known as Cocky; born 31 May 1963) is an English gangster and drugs trafficker who was formerly Interpol's Target One and was once listed on The Sunday Times Rich List.

Anand Pal Singh (31 May 1975 – 24 June 2017) was an Indian gangster mainly active in the cities of Rajasthan. He was a most-wanted gangster with a reward of ₹10 lakh on his head.

The Bomb man of Pae street (Estonian: Pae tänava pommimees) was a notorious serial bomber, later identified as Märt Ringmaa (30 May 1938 – 30 June 2021), who was active in Lasnamäe, Tallinn, Estonia. Over ten years, twelve IEDs made by Ringmaa exploded in public places, leading to the death of seven people and injuring six.

Yigal Amir (born May 31, 1970) is an Israeli murderer who assassinated the incumbent prime minister of Israel, Yitzhak Rabin, on November 4, 1995, at the conclusion of a rally in Tel Aviv, Israel. At the time of the murder, he was a law student at Bar-Ilan University.