Heathrow Hub railway station was a proposed interchange that would serve – mainly – a now disbanded potential alignment of High Speed 2 (HS2) services that would adjoin the expanded part of Heathrow Airport, England. It was a cornerstone part of an expansion plan put forward in 2008, by engineering firm Arup, to set up the UK's first high-speed rail network north-west of London.
The plan was dropped. The Government has chosen a rail axis that adopts the line of major tracks through Buckinghamshire rather than along the Great Western Main Line, thus north-west, in line with the general axis of the route to Birmingham and Manchester. It thus makes use of London Euston railway station which is very close to the existing continental connection station, London St Pancras International and requires less tunnelling and complex rail interchanges in London.