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Type of Korean soy sauce
a specific type of Korean soy sauce

Soup soy sauce or "guk ganjang" is a type of Korean soy sauce (ganjang) made entirely of fermented soybeans (meju) and brine. It is also a byproduct of doenjang production. Both lighter in colour and saltier than other Korean ganjang varieties, soup soy sauce is used mainly in guk (soup) and namul (a seasoned vegetable dish) in modern Korean cuisine.

Soup soy sauce is referred to by many different names. In the English speaking world, it is most commonly known as "soup soy sauce", which is a direct translation of guk ganjang (국간장). The name "soup soy sauce" is used because it is used mainly for soup in modern Korean cuisine. Also, it is the name used by many popular soy sauce brands such as Sempio, Daesang's Chung Jung One, and CJ Cheil Jedang's Beksul. Other names for the sauce include:
Hansik ganjang (한식 간장) – "Korean style soy sauce" is a name used by the Korean Ministry of Food and Drug Safety. Jaeraesik ganjang (재래식 간장) – "traditional soy sauce" is a name used for soup soy sauce when compared to gaeryang ganjang (개량 간장, "modernized soy sauce"), which is now the most widely used (and considered "regular") type of soy sauce in modern Korean cuisine. Joseon ganjang (조선간장) – "Joseon soy sauce" is a name used for soup soy sauce, when compared to Wae ganjang (왜간장, "Japanese soy sauce"). The term "Wae soy sauce" is used to refer to modernized gaeryang ganjang, which was introduced to Korea during the era of Japanese forced occupation. Jip ganjang (집간장) – "home soy sauce" is a name used for home brewed soup soy sauce.

The earliest soy sauce brewing in Korea seems to have begun prior to the era of the Three Kingdoms. The Records of the Three Kingdoms, a Chinese historical text written and published in the 3rd century, mentions that "Goguryeo people are good at brewing fermented soy beans", in the section called Dongyi (Eastern foreigners), in the Book of Wei. Jangdoks used for soy sauce brewing are found in the mural paintings of Anak Tomb No. 3 from 4th century Goguryeo. In Samguk Sagi, a historical record of the Three Kingdoms era, it is mentioned that ganjang and doenjang along with meju and jeotgal were prepared for the wedding ceremony of King Sinmun in February 683. Sikhwaji, a section from Goryeosa (History of Goryeo), recorded that ganjang and doenjang were included in the relief supplies in 1018, after a Khitan invasion, and in 1052, when a famine occurred. Joseon texts such as Guhwangchwaryo and Jeungbo sallim gyeongje contain detailed procedures on how to brew good quality ganjang and doenjang. Gyuhap chongseo explains how to pick a date for brewing, what to forbear, and how to keep and preserve ganjang and doenjang.

Soup soy sauce is made entirely of fermented soybeans and brine. The brewing process also produces doenjang, a Korean fermented bean paste. Meju, Korean soybean brick, is made around ipdong in early November. Soybeans are soaked overnight, boiled in salt water, and then pounded in a mortar (jeolgu) or coarsely ground with a millstone. About a doe (≈1.8 litres) or two of pounded soybeans are chunked, compressed, and shaped into a cube or a sphere called meju. The meju bricks are then dried in a cool, shaded area for a week to several weeks until firm. When the bricks harden, they are tied with rice straws to the eaves of the house, or put in a warm ondol room with rice straw, to ferment. In Jeongwol, the first month of the lunar year, well fermented meju bricks are washed and sun dried. After drying, the meju bricks are aged in onggi crocks (jangdok) with brine. Charcoal and chillies are added for their adsorbent and antibacterial properties, as well as folk religious beliefs that they drive away evil spirits. As the fermentation progresses, the brine acquires flavour and colour. This aged brine is boiled to become soy sauce, and the rest (aged meju chunks) is mashed to become soybean paste.