Kafr Thulth (Arabic: كفر ثلث) is a Palestinian town located on high, flat land south of Azzoun, 28 kilometers (17 mi) south of Tulkarm in the Qalqilya Governorate. The average elevation is 270 meters (890 ft) above sea level. According to the Palestinian Central Bureau of Statistics, the town's population was 5,606 in the 2017 census.

Kafr in Syriac means "village" and Thulth means "three" or "a third". This name preserves the place name, originally in Hebrew, of Baal-shalisha, an ancient Biblical village believed to have been located 3.5 miles (5.6 km) to the south at a site known in modern times as Khirbat Sirisya.

Kafr Thulth is bordered by Azzun to the south, Sanniriya and Biddya villages to the east and Deir Istiya to the west. In 1948, parts of Kharab and Aizab, such as, Salman, al-Moudwer, al-Sheikh Ahmad, al-Ashqar, Ras Tirah, al-Dabha, Kirash Kherba and Ras Atiya — villages or land areas that originally belonged to Kafr Thulth were separated from the town by the Green Line, which forms the border between Israel and the West Bank.

Kafr Thulth's land was extended to the border of the Auja stream and by the 19th century the town's total land area was about 50-60,000 dunams. It had bordered Habla, Jaljuliya, Azzun and Islah, but Kafr Thulth's jurisdiction decreased in 1954; Then, the distance was 924 dunams, while the distance reached up to Kherash Kherba that belong to Kafr Thulth 3,665 dunams.

In 1517, the village was incorporated into the Ottoman Empire with the rest of Palestine, and in 1596, Kafr Tult appeared in Ottoman tax registers as being in nahiya (subdistrict) of Jabal Qubal under the liwa' (district) of Nablus. It had a population of 13 households and 1 batchelor, all Muslims. They paid a fixed tax rate of 33.3%, on wheat, barley, summer crops, occasional revenues, goats and/or beehives; a total of 1,100 akçe.

In 1838, Kafr Thulth was included in a village list drawn up by Edward Robinson, part of Jurat Merda, south of Nablus, named as Kefr Telet.

In 1852, Robinson described Kafr Thulth as "a ruin", and the same did Victor Guérin in 1870. However, later researchers have noted that both only saw Kafr Thulth from a distance, and might have had it mixed up with the ruin Kufr Qara.

In 1870/1871 (1288 AH), an Ottoman census listed the village in the nahiya (sub-district) of Jamma'in al-Awwal, subordinate to Nablus.

In 1882 the PEF's Survey of Western Palestine described the village (called Khurbet Kefr Thilth) as "a small village on high ground, with two wells. It was in ruins in 1852, but has now a few inhabitants, the ground round is rough and uncultivated."

In the 1922 census of Palestine conducted by the British Mandate authorities, Kufr Thelth had a population of 643, all Muslims, while in the 1931 census Kafr Thulth, (including Khirbat Khris), had 169 occupied houses and a population of 955, still all Muslim.

In the 1945 statistics the population of Kafr Thulth was 1290 Muslims.

Ethnic group	Land ownership (dunums)
Arab	24,851
Jewish	82
Public	5
Total	24,938

Land usage type	Arab (dunum)	Jewish (dunum)
Irrigated and plantation	1,629	0
Area planted with olives	1,921	0
Planted with cereals	6,329	62
Built up	55	0
Cultivable	7,958	62
Non-cultivable	16,843	20
Lands usurped within armistice area	0	1,241 dunums

• 
  Kafr Thulth 1943 1:20,000
• 
  Kafr Thulth 1945 1:250,000

In the wake of the 1948 Arab–Israeli War, and after the 1949 Armistice Agreements, Kfar Thulth came under Jordanian rule. It was annexed by Jordan in 1950.

In 1961, the population of Kafr Thulth was 1,213.

Since the Six-Day War in 1967, Kafr Thulth has been under Israeli occupation.

After the 1995 accords, about 10.7% of the land was classified as Area B, the remaining 89.3% as Area C. Israel has confiscated 367 dunums of village land for the construction of the Israeli settlements of Karne Shomron, Ginot Shomron, Ma’ale Shomron and Emmanuel, as well as for the construction of the Israeli West Bank barrier.

In the village center, a sanctuary is dedicated to a saint named ash-Sheikh al-Maghazin. Legend holds that one person from Jenin, having married into the local 'Arar family, dreamt of al-Maghazin who directed him to establish a shrine at this location. Alternatively, another tradition suggest the original site was located on a hill outside the village, intended as a lookout to signal the approach of Crusader forces. The site, named for the Arabic term for raiding force, served as a resting place for Muslim warriors. Local traditions date the sanctuary's construction to more than 300 years ago. It is surrounded by a cemetery belonging to the 'Isa family.

Located in the center of the Al Gharbeh family cemetery, a maqam named ash-Sheikh Ali honors a saint of the same name, who in the village during the 19th century. Believing in his blessing power, the villagers made sure to fulfill his needs. After he left the village, they constructed the maqam at the spot where he had lived.

The people of Kafr Thulth originally came from Tafilah (in modern Jordan), Shuafat and Beit Lid.

The Al Gharbeh family is said to be the first to live in Kafr Thulth. According to their tradition, they lived there before the Islamic conquest, and converted to Islam shortly afterwards.

• Palestine Remembered Kafr Thulth Page
• Survey of Western Palestine, Map 14: IAA, Wikimedia commons
• Kafr Thulth Town (including ‘Arab al Khawla Locality) (Fact Sheet), Applied Research Institute–Jerusalem, (ARIJ)
• Kafr Thulth Town Profile (including ‘Arab al Khawla Locality), ARIJ
• Kafr Thulth, aerial photo, ARIJ
• Development Priorities and Needs in Kufr Thulth (including ‘Arab al Khawla Locality), ARIJ
• Resumption of Wall constructions in Kafr Thulth and Azzun lands – Qalqiliya governorate August 29, 2005, POICA