Pomponne (French pronunciation: [pɔ̃pɔn] ⓘ) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

On 23 December 1933, the second worst train accident in France occurred in Pomponne with a rear-end collision of Paris-Nancy express and Paris-Strasbourg fast train.

230 people were killed and 300 injured aboard the Nancy express as its 7 wood coaches were smashed.

The driver of the Strasbourg train had passed a signal at danger in darkness and fog, but the "Crocodile" acoustic warning system was found to have failed because the contacts had iced over.

This article related to a Seine-et-Marne location is a stub.