Gabrielle Alina Eugenia Maria Petit (20 February 1893 – 1 April 1916) was a Belgian spy who worked for the British Secret Service in German-occupied Belgium during World War I.

[1] Petit's espionage activities began in 1914, when she helped her wounded soldier fiancé, Maurice Gobert, cross the border into the neutral Netherlands to reunite with his regiment.

She was also an active distributor of the clandestine newspaper La Libre Belgique and assisted the underground mail service "Mot du Soldat".

[2] Petit was ultimately befriended and exposed by a German agent for Colonel Walter Nicolai and the Abteilung III b counterintelligence service, who had posed as Dutch.

[1] On 1 April 1916, Gabrielle Petit was, at the insistence of German military, shot by a firing squad at the Tir national execution field in Schaerbeek.

In May 1919 a state funeral was held for her, attended by Queen Elisabeth of Belgium, Cardinal Mercier of Brussels and Prime Minister Léon Delacroix, after which her remains (and those of fellow agents A. Bodson and A. Smekens) were buried with full military honors at Schaerbeek Cemetery.