King's Lynn railway station is the northern terminus of the Fen line in the east of England, serving the town of King's Lynn, Norfolk. It is 41 miles 47 chains (66.9 km) from Cambridge and 96 miles 75 chains (156.0 km) measured from London Liverpool Street.

The station and all trains calling here are operated by Great Northern (with service to and from London King's Cross.)

It has been the only station in the town since the closure of South Lynn railway station in 1959.

The act of Parliament for the Lynn and Ely Railway, the Lynn and Ely Railway Act 1845 (8 & 9 Vict. c. lv), received royal assent on 30 June 1845. Work started on the line in 1846 and so the railway arrived at Lynn on 27 October 1846. The original line ran South to Downham with the first station after Lynn being St Germain's. It took another two years to reach Ely. Great Eastern Railway. Lynn, when opened was a joint station (the Lynn and Ely Railway, and Lynn and Dereham Railway). However, on 22 July 1847 the Lynn and Ely and Lynn and Dereham railways were amalgamated to form the East Anglian Railway. A spur connecting the harbour was opened in 1849, and at one point was a complicated network of lines, boasting two swing bridges, serving premises on and around the town's South Quay. Another short branch, about three-quarters of a mile (1200 m) long, connecting the docks was opened in 1862 by the King's Lynn Docks & Railway Company. The railway was initially not welcomed by the port authorities in King's Lynn; they predicted that sea-bound trade would decline, and were later proved correct when through-trains to London ended up carrying the majority of freight to the capital.

Lynn opened as a junction station. The Lynn and Dereham Railway Act 1845 (8 & 9 Vict. c. cxxvi) of 21 July 1845, authorised a line which weaved a 26-mile (42 km) route to Dereham. The line opened to Narborough, on 27 October 1846, the same day the Lynn & Ely opened to Downham. The line was extended to Swaffham, on 10 August 1847, opening in stages between 1846 and 1848. The line ran out of Lynn in a South-Easterly direction with Middleton being the first station after Lynn. this later became part of the Great Eastern Railway.

Expansion followed with the opening of several branches. A line running north to the seaside resort of Hunstanton was opened in 1862, a journey celebrated by former Poet Laureate John Betjeman in a 1962 short BBC film about the line.

The Hunstanton line included Wolferton station, which served the Royal Family's Sandringham House, and so became the route of hundreds of Royal Trains. Since royal services to London had to first pass through King's Lynn before heading south to King's Cross, crowds on King's Lynn station cheering the Royal Train became one of the town's cherished and memorable traditions.

King's Lynn also received services from the Midland and Great Northern Joint Railway system, whose main station serving the town was in nearby South Lynn; a short shuttle service ran from King's Lynn to South Lynn as often as twenty times a day. The station opened in 1886, serving Sutton Bridge and Spalding to the west. Prior to the opening of South Lynn station, there had been a simple single platform station serving West Lynn, on the west bank of the River Ouse. An early constituent of the M&GN, the Lynn & Fakenham Railway, had used King's Lynn station, but ran into it from the north, via Gaywood Junction. This line was abandoned on the opening of the station at South Lynn. The "Lynn Avoiding" line was the last link in the chain which brought the eastern lines, which had reached Norwich in 1882, and Cromer in 1887, in direct contact with the lines west of Lynn.