Ambala Cantonment Junction railway station, often abbreviated as Ambala Cantt is a major junction station at the junction of Delhi–Kalka line and Moradabad–Ambala line cum Ambala–Attari line Ambala–Bathinda line and Ambala–Una Himachal line in India. It is the busiest railway station in the Indian state of Haryana and one of the oldest and busiest in India in terms of frequency of trains.

The Moradabad–Ambala line is a railway line connecting Moradabad in the Indian state of Uttar Pradesh and Ambala Cantonment in Haryana. The line is under the administrative jurisdiction of Northern Railway.