The 24-year-old O'Connor has played for the France Sevens team but this is his first call up at the top level.
The son of an Australian rugby league player who transferred to France, he has also played for his country at youth level.
The squad, the first one named by new national coach Guy Noves, will gather Sunday at the French rugby training centre near Paris to begin preparations for France's Six Nations opener against Italy on February 6.
Squad
Forwards (16):
Eddy Ben Arous (Racing 92), Jefferson Poirot (Bordeaux-Bègles), Uini Atonio (La Rochelle), Rabah Slimani (Stade Français), Guilhem Guirado (Toulon, cap.), Camille Chat (Racing 92), Yoann Maestri (Toulon), Alexandre Flanquart (Stade Français), Sébastien Vahaamahina (Clermont), Paul Jedrasiak (Clermont), Yacouba Camara (Toulouse), Damien Chouly (Clermont), Wenceslas Lauret (Racing 92), Louis Picamoles (Toulouse), Antoine Burban (Stade Français), Kevin Gourdon (La Rochelle).
Backs (15):
Sébastien Bézy (Toulouse), Morgan Parra (Clermont), Maxime Machenaud (Racing 92), Jules Plisson (Stade Français), Jean-Marc Doussain (Toulouse), Jonathan Danty (Stade Français), Alexandre Dumoulin (Racing 92), Wesley Fofana (Clermont), Gaël Fickou (Toulouse), Rémi Lamerat (Castres), Marvin O'Connor (Montpellier), Virimi Vakatawa (FFR), Maxime Médard (Toulouse), Hugo Bonneval (Stade Français), Scott Spedding (Clermont)