Southend Airport railway station is a stop on the Shenfield to Southend Line in the East of England; it serves London Southend Airport, the village of Sutton and northern parts of Southend-on-Sea, Essex. It is 39 miles 44 chains (63.65 km) down the line from London Liverpool Street and is situated between Rochford and Prittlewell. Train services provide an airport rail link between Southend Airport and Central London.

The station is managed by London Southend Airport but the trains serving it are operated by Greater Anglia. The Engineer's Line Reference for the line is SSV; the station's three-letter station code is SIA. The platforms have an operational length for 12-coach trains.

When Southend Airport officially opened as a municipal airport in 1935, the mayor of Southend suggested that it would be a good idea to open a railway station to serve the airport. For the first 75 years of the airport's operation, the nearest railway station was Rochford. After Southend Borough Council sold the airport to Regional Airports Ltd, a scheme was proposed in 1997 to build a station; planning permission was obtained from Rochford District Council. It was not until 2008 that the Stobart group began to advance the project and construction began in late 2009. The station was originally planned to open in 2009, but the opening date was postponed several times. In June 2011, National Express East Anglia trains began stopping at the station, but passengers were initially not permitted to get off.

The station was designed by Atkins and constructed by Birse Rail; it was opened by the Transport Minister Theresa Villiers in 2011. A new terminal building adjoining the station opened in 2012.

The typical Monday-Saturday off-peak service is:

• 2 trains per hour (tph) to London Liverpool Street, calling at all stations to Shenfield and then Stratford.
• 1 tph to London Liverpool Street, calling at all stations to Shenfield, then Romford and Stratford.
• 3 tph to Southend Victoria, calling at Prittlewell.

On Sunday, the service reduces to 2tph in each direction.

Since the Crossrail project was completed in 2023, interchange is provided with the Elizabeth line at Shenfield, Stratford and Liverpool Street, providing onward connections to central London and Heathrow Airport. Glyn Jones, chief executive of Stobart Aviation, proposed in 2018 that Crossrail should be extended to Southend Airport to alleviate capacity problems at Heathrow.

Preceding station	National Rail			Following station
Rochford		Greater Anglia Shenfield to Southend Line		Prittlewell

• "Trains". southendairport.com. Archived from the original on 5 January 2019. Retrieved 16 May 2019.
• "London Southend Airport". visitlondon.com. Archived from the original on 30 September 2017. Retrieved 16 May 2019.