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The Paris Gun (Paris Geschütz / Pariser Kanone) was the name given to a type of German long range siege gun, several of which were used to bombard Paris during World War I. They were in service from March to August 1918. When the guns were first employed, Parisians believed they had been bombed by a high altitude Zeppelin, as the sound of neither an airplane nor a gun could be heard. They were the largest pieces of artillery used during the war by barrel length, and qualify under the (later) formal definition of large calibre artillery. Also called the "Kaiser Wilhelm Geschütz" ("Kaiser Wilhelm Gun"), they were often confused with Big Bertha, the German howitzer used against Belgian forts in the Battle of Liège in 1914; indeed, the French called them by this name as well. They were also confused with the smaller "Langer Max" (Long Max) cannon, from which they were derived. Although the famous Krupp family artillery makers produced all these guns, the resemblance ended there. As military weapons, the Paris Guns were not a great success: the payload was small, the barrel required frequent replacement, and the guns' accuracy was good enough for only city sized targets. The German objective was to build a psychological weapon to attack the morale of the Parisians, not to destroy the city itself.

Due to the weapon's apparent total destruction by the Germans in the face of the final Entente offensives, its capabilities are not known with full certainty. Figures stated for the weapon's size, range, and performance varied widely depending on the source—not even the number of shells fired is certain. In the 1980s a long note on the gun was discovered and published. This was written by Dr. Fritz Rausenberger (in German), the Krupp engineer in charge of the gun's development, shortly before his death in 1926. Thanks to this, the details of the gun's design and capabilities were considerably clarified. The gun was capable of firing a The barrel was braced to counteract barrel drop due to its length and weight, and vibrations while firing; it was mounted on a special rail transportable carriage and fired from a prepared, concrete emplacement with a turntable. The original breech of the old gun did not require modification or reinforcement. Since it was based on a naval weapon, the gun was manned by a crew of 80 Imperial Navy sailors under the command of Vice Admiral Maximilian Rogge, chief of the Ordnance branch of the Admiralty. This reduced drag from air resistance, allowing the shell to achieve a range of over
The unfinished V 3 cannon would have been able to fire larger projectiles to a longer range, and with a substantially higher rate of fire. The unfinished Iraqi super gun would also have been substantially bigger.

The Paris Gun shells weighed
The small amount of explosive – around 6.6% of the weight of the shell – meant that the effect of its shellburst was small for the shell's size. The thickness of the shell casing, to withstand the forces of firing, meant that shells would explode into a comparatively small number of large fragments, limiting their destructive effect. The shells were propelled at such a high velocity that each successive shot wore away a considerable amount of steel from the rifled bore. Each shell was sequentially numbered according to its increasing diameter, and had to be fired in numeric order, lest the projectile lodge in the bore and the gun explode. Also, when the shell was rammed into the gun, the chamber was precisely measured to determine the difference in its length: a few inches off would cause a great variance in the velocity, and with it, the range. Then, with the variance determined, the additional quantity of propellant was calculated, and its measure taken from a special car and added to the regular charge. After 65 rounds had been fired, each of progressively larger caliber to allow for wear, the barrel was sent back to Krupp and rebored with a new set of shells. The shell's explosive was contained in two compartments, separated by a wall. This strengthened the shell and supported the explosive charge under the acceleration of firing. One of the shell's two fuzes was mounted in the wall, with the other in the base of the shell. The fuzes proved very reliable as every single one of the 303 shells that landed in and around Paris successfully detonated. The shell's nose was fitted with a streamlined, lightweight, ballistic cap and the side had grooves that engaged with the rifling of the gun barrel, spinning the shell as it was fired so its flight was stable. Two copper driving bands provided a gas tight seal against the gun barrel during firing. The gun was fired from a wooded hill (Le mont de Joie) near Crépy, and the first shell landed at 7:18 a. m. on 23 March 1918 on the Quai de la Seine, the explosion being heard across the city. Shells continued to land at 15 minute intervals, with 21 counted on the first day. On the first day, fifteen people were killed and thirty six wounded. Within a few hours, sufficient casing fragments had been collected to show that the explosions were the result of shells, not bombs. By the end of the day, military authorities were aware the shells were being fired from behind German lines by a new long range gun, although there was initial press speculation on the origin of the shells. This included the theory they were being fired by German agents close by Paris, or even within the city itself, so abandoned quarries close to the city were searched for a hidden gun. by the French reconnaissance pilot Didier Daurat, the path of the shells which landed in Paris having revealed the direction from which they were being fired. The closest emplacement was engaged by a 34 cm railway gun while the other two sites were bombed by aircraft, although this failed to interrupt the German bombardment. A further emplacement, later identified as specifically designed for the Paris Gun, was found by advancing US troops at the beginning of August, on the north side of the wooded hill at Coucy le Château Auffrique, some from Paris. The gun was taken back to Germany in August 1918 as Allied advances threatened its security. No guns were ever captured by the Allies. It is believed that near the end of the war they were completely destroyed by the Germans. One spare mounting was captured by American troops in Bruyères sur Fère, near Château Thierry, but the gun was never found; the construction plans seem to have been destroyed as well.

Under the terms of the Treaty of Versailles, the Germans were required to turn over a complete Paris Gun to the Allies, but they never complied with this. In the 1930s, the German Army became interested in rockets for long range artillery as a replacement for the Paris Gun—which was specifically banned under the Versailles Treaty. This work eventually led to the V 2 rocket that was used in World War II. Despite the ban, Krupp continued theoretical work on long range guns. They started experimental work after the Nazi government began funding the project upon coming to power in 1933. This research led to the 21 cm K 12 (E), a refinement of the Paris Gun design concept. Although it was broadly similar in size and range to its predecessor, Krupp's engineers had significantly reduced the problem of barrel wear. They also improved mobility over the fixed Paris Gun by making the K 12 a railway gun. The first K 12 was delivered to the German Army in 1939 and a second in 1940. During World War II, they were deployed in the Nord Pas de Calais region of France; they were used to shell Kent in Southern England between late 1940 and early 1941. One gun was captured by Allied forces in the Netherlands in 1945.

A parody of the Paris Gun appears in the Charlie Chaplin movie The Great Dictator. Firing at the Cathedral of Notre Dame, the "Tomanians" (the fictional country that represented Germany) succeed in blowing up a small outhouse. The destruction of the St Gervais et St Protais Church inspired Romain Rolland to write his novel Pierre et Luce.