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Erste Pläne für den Bau einer Untergrundbahn in Warschau datieren aus dem Jahr 1918, als diese Idee als Reaktion auf den wiedererlangten Status Warschaus als polnische Hauptstadt aufkam. Es wurde erwartet, dass ein solches unterirdisches Schienenverkehrsmittel die Transportprobleme der dicht bebauten Innenstadt lösen würde.

Proper preliminary planning and boring work were initiated by the Warsaw Tramway Authority in 1925, with construction expected to start in the late 1920s. The Great Depression buried those plans as Poland and the world was gripped by hardship. In 1934, with the election of a new mayor of Warsaw, Stefan Starzyński, work was to resume on the metro. The mayor dusted off the plans from the mid-1920s, and with some minor adjustments, construction of the metro was planned to start by the late 1930s, with a projected finishing date of the first of two projected lines scheduled for the mid 1940s. By then, the subway network was to consist of two lines. The A line (North-South line, 7,5 km or 4,6 mi long), followed most of today's route and was to link the southernmost borough of Mokotów with the city centre and the northern borough of Żoliborz. This line was to be connected with the newly-constructed Warszawa Główna train station and the railway tunnel crossing the city from west to the east. The B line (East-West, 6,3 km or 4 mi long) was to start beneath the westernmost borough of Wola, proceed along the Chłodna street to the pivotal station beneath the Saxon Sq. and then further eastwards to the Vistula river escarpment. There, the line was to go overground, cross the river through a newly-built bridge and proceed to the easternmost railway station of Warszawa Wschodnia. Altogether, in 35 years 7 lines were to be built). The works finally started in 1938, but World War II brought an end to the ambitious undertaking. The short trace tunnels made in 1938 serve as a wine cellar today.

The city suffered heavily during the war. It was damaged during the siege in 1939 and in 1943 the northern part of downtown Warsaw was razed to the ground following the Warsaw Ghetto Uprising. Finally, after the Warsaw Uprising of 1944 up to 90% of the buildings on the left bank of the Vistula were reduced to ruin by the Germans. The population returned to the city in 1945 and came upon sheer devastation. However, reconstruction of Warsaw started almost immediately. Although the majority of pre-war projects perished during the Uprising, most of the engineers behind their creation survived the war and returned to their city to take part in its rebirth. However, the new Communist authorities of Poland envisioned a city completely different from what it used to be before the war. As the ideal communist city, Warsaw was to be decentralized and a need to commute to the city centre was to be reduced. Thus the Reconstruction of Warsaw Office (BOS) commissioned a number of engineers to prepare a project of a fast tramway (Fast Urban Railway, SKM) crossing the city in a deep cutting. Although to a large extent it was to follow the A line of the pre-war plans, only the central stations were to be located underground. However, by the end of the decade the project was cancelled. Instead, in 1948 a different concept was considered. This time the SKM was to be a rapid transit line at a depth of up to 15 metres (50 feet). The suggested North-South direction, with three parallel branches of the same line in the city centre, corresponded to the planned development of the city along the Vistula. The works however never started and this project was also cancelled.

In the 1950s, as the Cold War raged on, Soviet strategic plans required that a secure transport link across the river Vistula be built. One of the ways to achieve this was to create a deep metro system in Warsaw (up to 46 metres or 150 feet beneath the ground), which would be interlinked with the rail network and could serve as an underground conduit for transporting troops. Plans assumed that the first line (ca. 11 kilometres or 7 miles) would lie along North-South axis, with a branch of the same line crossing the Vistula river in the city centre. The construction works started almost simultaneously at 17 different points on both sides of the river. Until 1953 771 metres of tunnels were built, however after the death of Joseph Stalin and the start of a period of détente, all works were halted under the pretext of technical difficulties. In following years only one junction tunnel and one shield-driven tunnel were continued to be constructed. These works were undertaken experimentally, in order to discover the best driving methods suitable for the ground conditions beneath Warsaw (pliocene clay formations layer spread beneath quaternary soils). Finally, in 1957 all works were halted.

Since 1955 there was a return to the old idea of a shallow metro network. However, the planning phase proceeded at a very slow pace and the proceeding economical crisis prevented all successive communist governments from actually starting a serious work. Finally, in 1984, the programme was approved by the Communist government and the first tunnels were built. Lack of funds, poor planning, and tedious bureaucracy meant that the work went forward very slowly, at a speed no greater than 2 metres a day. The Metro was opened in 1995 with a total of 11 stations. The line now has 16 stations along a distance of approximately 15 kilometres, and will be completed with a total of 21 stations by early 2008.

Perhaps alone among world metro systems, tickets are not available from the transport company itself, but from private-run kiosks; however, the ticket system is valid for all Warsaw public transportation, including the Metro, buses, trams and some suburban trains. Because of that the tickets can be obtained in any of the hundreds of kiosks located across the city, in addition to post offices, transportation offices and some shops. Besides, all stations have a kiosk located not more than 5 metres from an entrance. In addition to tickets, one can also purchase a proximity card at certain kiosks or post offices which can be charged for up to 3 months at a time. As a result, they are much cheaper than purchasing tickets daily.

Another interesting feature of the Warsaw Metro is that the southern stations (Kabaty - Wierzbno) serve as a bomb and atomic shelter: all stations are guarded by massive gates.