Olga Hepnarová (30 June 1951 – 12 March 1975) was a Czechoslovak rampage killer, who on 10 July 1973, killed eight people with a truck in Prague.

Hepnarová was an average child, but later developed psychiatric problems, which manifested in an inability to communicate with people.

On the morning of 7 August 1970, using a bottle of gasoline, Hepnarová set fire to the door in the living area of the building.

[4] Her original plans included derailment of an express train or detonation of an explosive in a room full of people, but she decided that these were too technically demanding and instead decided on a mass shooting: she planned to obtain an automatic firearm and fire on people on Wenceslas Square.

[4] From 11 January to 10 July 1973, Hepnarová lived in room 502 in what is now Penzion Malešice, which served as a hostel for the Prague Communications business.

The next day, on 10 July, she successfully completed a test drive to demonstrate that she was able to control the specific type of truck she wanted to rent.

[4] Before the attack, Hepnarová had sent a letter to two newspapers, Svobodné slovo and Mladý svět, explaining her actions as revenge for the hatred she felt was directed against her by her family and the world.

She planned her actions, as she took into account that the ground sloped down to the tram stop, which allowed her to gain speed for the maximum death toll.

After several psychiatric examinations Hepnarová was deemed criminally responsible for her actions, and the Prime Minister of Czechoslovakia, Lubomír Štrougal, refused to grant her a pardon.

Some reports say she was calm, while others say she became hysterical and started screaming and begging for her life, and that the guards had to drag her to the gallows.

[2] In 1991, Bohumil Hrabal published the novel Ponorné říčky, in which he describes the remorse felt by an executioner from Pankrác for sending a "beautiful lady" called Olga to the gallows.

[10] The Czech novel Oprátka za osm mrtvých by Roman Cílek (2001) tells the story of Hepnarová, and contains a collection of contemporary documents.

[11] In 2021, the album Dievčatko s náklaďákom (in English: Girl with a Truck) by the Slovak band Les Myzérables was released, which focuses on the life and death of Olga Hepnarová.