Heavy mortars are large-calibre mortars designed to fire a relatively heavy shell on a high angle trajectory. Such weapons have a relatively short range, but are usually less complex than similar calibre field artillery.

This category includes the "Trench Mortars" of World War I which were all too heavy and cumbersome, and hence lacked the mobility, to be classed as infantry mortars.

Muzzle-loading

Caliber Caliber In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....  (mm)	Weapon name	Country of origin	Design
50.8	2 inch Medium Mortar 2 inch Medium Mortar The 2 inch Medium Trench Mortar, also known as the 2-inch Howitzer, and nicknamed the "Toffee Apple" or "Plum Pudding" mortar, was a British SBML medium trench mortar in use in World War I from mid 1915 to mid 1917...  "Toffee Apple"		World War I World War I World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...
58.3	Mortier de 58 mm type 2 Mortier de 58 mm type 2 The Mortier de 58 mm type 2, also known as the Crapouillot or "little toad" from its appearance, was the standard French medium trench mortar of World War I.-Combat use:3 types of bomb were available :...  "Crapouillot"		World War I World War I World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...
90	20 cm leLdgW 20 cm leLdgW The 20 cm leichter Ladungswerfer was a spigot mortar used by Germany during World War II. It was used by engineers to demolish obstacles and strongpoints. It was gradually withdrawn from front-line service from 1942....	Nazi Germany	World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
105	10.5 cm Luftminenwerfer M15 10.5 cm Luftminenwerfer M 15 The 10.5 cm Luftminenwerfer M 15 was a medium mortar used by Austria-Hungary in World War I. It was developed by the German firm of Ehrhardt & Sehmer. It was a rigid-recoil, muzzle-loading mortar on a fixed base that used compressed air to propel the mortar bomb to the target. Each cylinder of...		World War I
105	10 cm Nebelwerfer 35 10 cm Nebelwerfer 35 The 10 cm Nebelwerfer 35 was a heavy mortar used by Germany during World War II. Much like the American M2 4.2 inch mortar it was intended to deliver chemical munitions, such as gas and smoke shells. Unlike the American weapon it appears to have had an ordinary high-explosive shell from the...	Nazi Germany	World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
140	14 cm Minenwerfer M 15 14 cm Minenwerfer M 15 The 14 cm Minenwerfer M 15 was a medium mortar used by Austria-Hungary in World War I. It was developed by Škoda Works as an alternative to a German design from Rheinische Metallwarenfabrik/Ehrhardt for which ammunition could not be procured. It was a rigid-recoil, rifled, muzzle-loading...		World War I
148	Coehorn mortar M. 1841		1841
152	Newton 6 inch Mortar Newton 6 inch Mortar The Newton 6 inch Mortar was the standard British medium mortar in World War I from early 1917 onwards.-Description:The Newton 6 inch replaced the 2 inch Medium Mortar beginning in February 1917....		World War I
160	160mm IMI Mortar		Cold War
160	Soltam M-66 Soltam M-66 M-66 is a 160 mm mortar manufactured by Soltam of Israel. The weapon was based on an earlier design of the 160mm M-58 mortar by Vammas of Finland...
160	Patria Vammas M58
169	38 cm sLdgW 38 cm sLdgW The 38 cm schwerer Ladungswerfer was a spigot mortar used by Germany during World War II. It was used by engineers to demolish obstacles and strongpoints...	Nazi Germany	World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
170	17 cm mittlerer Minenwerfer 17 cm mittlerer Minenwerfer The 17 cm mittlerer Minenwerfer was a mortar used by Germany in World War I.-Development and Use:The weapon was developed for use by engineer troops after the Siege of Port Arthur during the Russo-Japanese War of 1905. It illustrated the usefulness of this type of weapon in destroying bunkers and...	German Empire	World War I
203	8-inch siege mortar M.1841		1841
203	Livens Projector Livens Projector The Livens Projector was a simple mortar-like weapon that could throw large drums filled with flammable or toxic chemicals. In the First World War, the Livens Projector became the standard means of delivering gas attacks and it remained in the arsenal of the British Army until the early years of...		World War I
225	22.5 cm Minenwerfer M 15 22.5 cm Minenwerfer M 15 The 22.5 cm Minenwerfer M 15 was a heavy mortar used by Austria-Hungary in World War I. It was developed by Böhler as an alternative to the German Ehrhardt 25 cm schwere Minenwerfer which Böhler was having problems building under license. It was a muzzle-loading, smooth-bore mortar that had no...		World War I
240	Dumezil-Batignolles Mortier de 240 mm 240 mm Trench Mortar The 240 mm Trench Mortar, or Mortier de 240 mm, was a large calibre mortar of World War I. An original French design, it was developed by Batignolles Company of Paris and introduced in 1915.-Service:...		World War I
240	9.45 inch Heavy Mortar 9.45 inch Heavy Mortar The ML 9.45 inch Heavy Trench Mortar, nicknamed the Flying Pig, was a large calibre mortar of World War I and the standard British heavy mortar from Autumn 1916 onwards. It was a modification of an original French design, the Mortier de 240 mm developed by Batignolles Company of Paris and...  "Flying Pig"		World War I
250	25 cm schwere Minenwerfer 25 cm schwere Minenwerfer The 25 cm schwerer Minenwerfer was a heavy trench mortar used by Germany in World War I. It was developed for use by engineer troops after the Siege of Port Arthur during the Russo-Japanese War of 1905 illustrated the usefulness of this class of weapon in destroying bunkers and fortifications...	German Empire	World War I
254	10-inch siege mortar M. 1841		1841
254	10-inch seacoast mortar M. 1841		1841
260	26 cm Minenwerfer M 17 26 cm Minenwerfer M 17 The 26 cm Minenwerfer M 17 was a heavy trench mortar used by Austria-Hungary in World War I. It was developed by Skoda as an alternative to copying captured Italian 240 mm Trench Mortars. Skoda presented two versions, one with a rigid barrel, and the other with a recoil system. The former was...		World War I
320	320 mm Type 98 mortar		World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
325	Mortier de 12 Gribeauval Mortier de 12 Gribeauval The Mortier de 12 pouces Gribeauval was a French mortar and part of the Gribeauval system developed by Jean Baptiste Vaquette de Gribeauval. It was part of the siege artillery...		1781
330	13-inch seacoast mortar M. 1861		1861
914	Little David Little David Little David was the nickname of an American 36 inch caliber mortar used for test firing aerial bombs during World War II.-History:...		World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
914	Mallet's Mortar Mallet's Mortar Mallet's Mortar was a British siege mortar built for, but never used in, the Crimean WarThe mortar was design by Robert Mallet. It was constructed in sections so that it could be transported....		1857

Breech-loading

Caliber Caliber In guns including firearms, caliber or calibre is the approximate internal diameter of the barrel in relation to the diameter of the projectile used in it....  (mm)	Weapon name	Country of origin	Period
105	10 cm Nebelwerfer 40 10 cm Nebelwerfer 40 The 10 cm Nebelwerfer 40 was a heavy mortar used by Germany during the Second World War. Much like the American M2 4.2 inch mortar it was intended to deliver chemical munitions, such as gas and smoke shells, as well as ordinary high-explosive shells...	Nazi Germany	World War II World War II World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...
120	12 cm Luftminenwerfer M16 12 cm Luftminenwerfer M 16 The 12 cm Luftminenwerfer M 16 was a medium mortar used by Austria-Hungary in World War I. It was developed by Austria Metal Works in Brno from their earlier, rejected, 8 cm project. It was a rigid-recoil, smooth-bore, breech-loading design that had to be levered around to aim at new...		World War I
150	15 cm Luftminenwerfer M 15 M. E. 15 cm Luftminenwerfer M 15 M. E. The 15 cm Luftminenwerfer M 15 M. E. was a medium mortar used by Austria-Hungary in World War I. It was developed by the German firm Maschinenfabrik Esslingen in response to a German requirement...		World War I
160	160mm Mortar M1943 160mm Mortar M1943 The Soviet 160 mm Mortar M1943 was a smoothbore breech loading heavy mortar which fired a massive 160 mm bomb. The M1943 was the heaviest mortar used by Soviet troops in World War II. Around 535 of these weapons were fielded with Soviet forces during the war...		World War II
200	20 cm Luftminenwerfer M 16 20 cm Luftminenwerfer M 16 The 20 cm Luftminenwerfer M 16 was a heavy mortar used by Austria-Hungary in World War I. It was developed by Austria Metal Works in Brno from their earlier 12 cm Luftminenwerfer M 16. It was a rigid-recoil, smooth-bore, muzzle-loading design that had to be levered around to aim at new targets...		World War I
210	21 cm GrW 69 21 cm GrW 69 The 21 cm Granatenwerfer 69 was a mortar used by Germany during World War II. This weapon may also be known as the GR 19 and B 19....	Nazi Germany	World War II
240	M240 towed mortar 240 mm mortar M240 -Description:The Soviet 240 mm Mortar M240 is a smoothbore breech loading heavy mortar which fired a massive 240 mm bomb. It consists of a smooth-bored barrel with breech and breech-block frame, a frame with shock absorbers, the mount with training and equilibrating mechanisms, a two-wheel...		Cold War Cold War The Cold War was the continuing state from roughly 1946 to 1991 of political conflict, military tension, proxy wars, and economic competition between the Communist World—primarily the Soviet Union and its satellite states and allies—and the powers of the Western world, primarily the United States...
280	Mortier de 280 Schneider Mortier de 280 modèle 1914 Schneider The Mortier de 280 modèle 1914 Schneider was a French siege howitzer, manufactured in small numbers by the Schneider et Cie company, used during World War I. Used primarily by France, fewer than forty were sold to Russia and took part in the fighting on the Eastern Front, the Russian Civil War and...		World War I
280	Blind Pig LOLZ Mortar		World War I
325	12-inch Coast defense mortar M1886, M1890, and M1908		WWI, WWII
420	2B1 Oka 2B1 Oka 2B1 Oka is a Soviet 420 mm self-propelled gun. 2B1 is its GRAU designation.An experimental model was ready in 1957. Its chassis , was designed and built by the Kirov Plant. Its 20 meter barrel allowed it to fire 750 kg rounds up to 45 km. Due to its complexity of loading it had a...		Cold War