The Inverness and Aberdeen Junction Railway (I&AJR) was a railway company in Scotland, created to connect other railways and complete the route between Inverness and Aberdeen. The Inverness and Nairn Railway had opened to the public on 7 November 1855 and the Great North of Scotland Railway (GNoSR) was building from Aberdeen to Keith. The I&AJR opened, closing the gap, on 18 August 1856. It found the GNoSR a difficult partner and passenger journeys from Inverness to the south via Aberdeen were inconvenient and circuitous.