Noctilien is the night bus service in Paris and its agglomeration. It is managed by the Île-de-France Mobilités (formerly the STIF), the Île-de-France regional public transit authority, and operated by RATP (with 32 lines) and Transilien SNCF (with 20 lines). It replaced the previous Noctambus service on the night of 20/21 September 2005, providing for a larger number of lines than before and claiming to be better adapted to night-time transport needs. In place of the previous hub-and-spoke scheme in which all buses terminated at and departed from the heart of Paris at Châtelet, Noctilien's new service includes buses operating between banlieues (the communes surrounding Paris proper) as well as outbound lines running from Paris' four main railway stations: Gare de l'Est, Gare de Lyon, Gare Montparnasse and Gare Saint-Lazare. In addition, these four stations are also connected to each other by a regular night bus service. Noctilien operates 52 bus lines over the whole of Paris and the Île-de-France region from around 12:30 a.m. when the rail network and the regular daytime bus service ends, until around 05:30 the next morning when they resume service. It is made up of: Like Transilien, the name "Noctilien" is formed by analogy with "Francilien" — the French demonym for residents of Île-de-France.

Noctilien lines

The time intervals indicated here may depend on the day of week since service is reinforced on Friday and Saturday nights and on days that precede bank holidays. via Gare de Lyon → Gare Montparnasse → Gare Saint-Lazare. Every 14 minutes. via Gare de Lyon → Gare de l'Est → Gare Saint-Lazare. Every 14 minutes.

Line numbering scheme

Each bus line number starts with for Noctilien followed by a two or three digit number: