The 12365 / 12366 Patna Junction–Ranchi Jan Shatabdi Express is a Superfast Express train of the Jan Shatabdi Express series belonging to Indian Railways – East Central Railway zone that runs between Patna Junction and Ranchi Junction in India.

It operates as train number 12365 from Patna Junction to Ranchi Junction and as train number 12366 in the reverse direction, serving the states of Bihar and Jharkhand.

As is customary with most train services in India, coach composition may be amended at the discretion of Indian Railways depending on demand.

The 12365 Patna Junction–Ranchi Junction Jan Shatabdi Express covers the distance of 411 km (255 mi) in 7 hours 45 mins (56.05 km/h) and in 7 hours 55 mins as 12366 Ranchi Junction–Patna Junction Jan Shatabdi Express (57.08 km/h).

As the average speed of the train is above 55 km/h (34 mph), as per Indian Railways rules, its fare includes a Superfast surcharge.