Mill Hill Broadway railway station is on the Midland Main Line in England, serving the suburb of Mill Hill in the London Borough of Barnet, north London. It is 9 miles 28 chains (15.0 km) down the line from St Pancras and is situated between Hendon to the south and Elstree & Borehamwood to the north. Its three-letter station code is MIL.

The station is served by Thameslink-operated trains on the Thameslink route. It is in Transport for London's Travelcard Zone 4.

The station was built by the Midland Railway as simply "Mill Hill" in 1868 on its extension to St. Pancras, being renamed in 1950. The station was rebuilt in the 1960s in connection with the construction of the M1 motorway.

Since 14 September 2014 train services have been operated by Thameslink.

Prior to the major engineering works to create the "Thameslink Box" at St Pancras, Mill Hill Broadway was also served at peak times by Moorgate fast trains. These trains provided a non-stop service to King's Cross Thameslink twice an hour. In 2009, several morning peak southbound fast services (stopping only at West Hampstead Thameslink) and several evening peak northbound fast services (stopping only at West Hampstead Thameslink) were reinstated.

From March 2009, Southeastern and Thameslink began running some peak hour trains from Sevenoaks to Luton, though in the off-peak these services turn back at Kentish Town.

All services at Mill Hill Broadway are operated by Thameslink using Class 700 EMUs.

The typical off-peak service in trains per hour is:

• 6 tph to St Albans City of which 2 continue to Luton
• 2 tph to Rainham via Dartford
• 4 tph to Sutton (2 of these run via Mitcham Junction and 2 run via Wimbledon)

During the peak hours, the station is served by additional services between Luton and Orpington via Catford, as well as some late evening services to and from Bedford.

The station is also served by a night service between Bedford and Three Bridges on Sunday to Friday nights.

Preceding station	National Rail			Following station
Elstree & Borehamwood		Thameslink Thameslink		Hendon

London Buses routes 114, 186, 221, 240, 251, 302, 303, 605, 628 and 688 serve the station.

• 
  Southbound view from Platform 1, with Midland Mainline Class 222 Meridian unit in the distance.
• 
  Northbound view from Platform 1.
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  Ticket office at Mill Hill Broadway station.
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  Sign on the A5100 Mill Hill Broadway, as it passes under the M1 motorway
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  Signage on platforms (summer 2009)

• Train times and station information for Mill Hill Broadway railway station from National Rail