noctumbus

Night buses at Rebublique are the N01 and N02, which circulate clockwise and counterclockwise covering Gare de l'Est, Gare St Lazare, Gare Montparnasse, Port Royale, Gare d'Austerlitz, Gare de Lyon, Bastille.
N12 to Chatelet, St Michel, Gare Montparnasse, Pont de Sevres.
N23 to Chatelet.
N141, N142 to Gare de l'Est.
Connections to other night buses at interchange points. Lower lefthand corner of this pdf.
http://www.ratp.fr/informer/pdf/orienter/f_plan.php?loc=reseaux&nompdf=bus_paris_geo&fm=gif

Edit - Better one with just the Night Buses.
http://www.ratp.fr/informer/pdf/orienter/f_plan.php?loc=reseaux&nompdf=noctilien&fm=pdf

It's "Noctilien", not Noctambus : )

Thanks for the correction. Shows how old I am.