The Leong San Tong Khoo Kongsi (simplified Chinese: 邱公司) (Penang Hokkien: Khu-kong-si) or "Khoo Kongsi" for short, is the largest Hokkien clanhouse in Malaysia with elaborate and highly ornamented architecture, a mark of the dominant presence of the Chinese in Penang, Malaysia. The famous Khoo Kongsi is the grandest clan temple in the country. It is also one of the city's major historic attractions. The clan temple has retained its authentic historic setting, which includes an association building, a traditional theatre and the late 19th century rowhouses for clan members, all clustered around a granite-paved square. It is located in Cannon Square in the heart of the oldest part of the city of George Town, in the midst of narrow, winding lanes and quaint-looking pre-War houses exuding a palpable old world charm.

The Khoo Kongsi is a clan association of the Leong San Tong (Dragon Mountain Hall) clan, whose forefathers came from XinAn Village, Haicang District, Xiamen Municipal in Fujian province and were of Hoklo descent. The Khoos were among the wealthy Straits Chinese traders of 17th century Malacca and early Penang. In the 19th century, the clan complex resembled a miniature clan village, with its own self-government as well as educational, financial, welfare and social organisations. The clan temple was built in 1906 when the Khoo clan was at the height of wealth and eminence in Penang society.

The forefathers of the Khoo family who emigrated from South China built it as a clanhouse for members of the Khoo family in 1851. It was burnt down in 1901, allegedly struck by lightning, and the Chinese believed that it was due to its resemblance to the Emperor's palace, which provoked the gods. A scaled-down version was later built in 1902 and completed in 1906. Even so, the complex boasts a magnificent hall embellished with intricate carvings and richly ornamented beams of the finest wood bearing the mark of master craftsmen from China. The clan temple is dedicated to the clan's Patron Deities and also houses a collection of ancestral tablets. Chinese operas are still staged at the theatre during the seventh lunar month.

Like many such clan associations in South East Asia, Khoo Kongsi is no longer the center of important social activities and functions that it once held. Different strategies and ideas are being implemented to redefine the place of clan associations in the 21st century. Due to its location in the UNESCO World Heritage area of George Town, it is a popular attraction for tourists interested in local culture.

The clan is often mistakenly thought to represent all Chinese people with the surname of Khoo. However the clan only represents those whose ancestral lineage originates from Sin Kang Seah, Sin Aun Village, Sam Toh District, Hai Teng County, Chiang Chew Prefecture, Fujian Province, China which is presently known as Sin Aun Village in Xing Lin District, Xing Lin Town, Amoy (Xiamen). The clan's progenitor is Khoo Chian Eng, the 4th son of his father Chan Cheong Kong, making him a descendant of Chan Yan Si of Oon Leong who lived during the Tang Dynasty and a 14th generation descendant Chan Leong Kong, an advisor of one of the Emperors of the Song dynasty.

It is noted that Khoo Chian Eng moved to San Peng Ang in Tong Aun County (now Tong'an District) approximately 650 years ago during the Yuan Dynasty, where he married Saw See Cheng and where they had their son Buan Seng Kong. Buan Seng Kong, whose family had later moved to Teh Toon (Known later as Sin Kang Village and most recently as Sin Aun Village) added the surname of Khoo during the early Ming dynasty. Buan Seng Kong who was later known as Khoo Buan Seng went on to have two sons Tua Huat and Cheng Huat whose descendants migrated over China, Taiwan, Malaysia, Indonesia, Thailand, The Philippines, Myanmar and some American and European countries.

In order to keep track of descendants the clan uses a genealogical chart which serves as a naming guide for each generation of clansmen, however this is not always followed, especially in modern times.

Genealogical naming chart of the Penang Khoo's (8th Generation to 45th Generation)

Penang Hokkien pronunciation	Generation (8-20)	Generation (21- 33)	Penang Hokkien pronunciation	Generation (33-	Penang Hokkien pronunciation
Kay	8th	21st	Kay	33rd	Chian
Phaik	9th	2nd	Boo	34th	Chiew
Theng	10th	23rd	Teng	35th	Saik
Hoon	11th	24th	Kah	36th	Hock
Swee	12th	25th	Lay	37th	Har
Jin	13th	26th	Sin	38th	Ee
Boon	14th	27th	Kar	39th	Boh
Huan	15th	28th	It	40th	Choo
Kok	16th	29th	Kuan	41st	Ean
Hua	17th	30th	Soo	42nd	Ek
Tai	18th	31st	Sin	43rd	Say
Heng	19th	32nd	Aing	44th	Giap
Soo	20th	33rd	Chian	45th	Giang

The clan follows a specific structure to more accurately determine its descendants and hence their relations to one another. This structure is known in Penang Hokkien as the See Tua Kak (Four Sectional Groups) and were formed by the 4th to 8th generations of the family to form a total of 13 pang which is the Penang Hokkien word for branch/branches.

See Tua Kak

1. Gim Pang, Chan Pang & Chen Pang
2. Mooi Pang, Soo Pang
3. Goh Pang, Thay Pang & Chneh Pang
4. Hai Teoh, Hai Jee, Hai Sar, Hai See & Hai Goh (These branches are often referred to as the Kai Kee Kak)

The Hai Kee Kak are the largest branch of the See Tua Kak These branches then went on to form their own smaller kongsi's namely the Boon San Tong Khoo Kongsi and Khoo Si Toon Keng Tong Khoo Kongsi.

• 
  Khoo Kongsi illuminated for Chinese New Year celebrations in 2024
• 
  The Ceiling of the Khoo Kongsi
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  Hallway at the Khoo Kongsi
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  Altar with ancestral tablets

• Khoo Teow Pang (1790-1860): One of the early founders of Khian Tek Tong Society and the Hock Teik Cheng Sin Temple. He was descended from the Goh Pang branch of the family and was one of the ten family headmen in the first Board of Trustees of Khoo Kongsi.
• Khoo Thean Teik (1818-1860): One of Penang's most notorious and powerful Hokkien leaders in the 19th century and was involved in the Penang Riots of 1867. He was descended from the Hai Jee branch of the family.

Media related to Leong San Tong Khoo Kongsi, Penang at Wikimedia Commons

• Khoo Kongsi Official Website
• Khoo kongsi photos