Kanzuri (寒（かん）造（ず）里（り）; [kaɰ̃zɯɾi] KAHN-zoo-ri) is a type of Japanese fermented chili paste manufactured in Niigata Prefecture. Originally a traditional condiment from the Jōetsu region, the name "kanzuri" was trademarked in 1966 by the Kanzuri, Co. Ltd. of Myōkō, the sole maker of the product.

Kanzuri is a chili paste with a bright red color. Its texture and flavor are similar to that of yuzu koshō, which is prepared with the identical principal ingredients, but kanzuri has a milder flavor that is sweeter and less salty. The flavor of kanzuri is also comparable to that of Tabasco sauce or doubanjiang.

The process to make kanzuri typically takes approximately three to four years. The ingredients used are tōgarashi, yuzu, salt, and kōji mold.

Production begins in April of the first year with the planting of the tōgarashi used for kanzuri. The particular cultivar used for the making of kanzuri is known as S-30; it is locally grown and about three times larger than other tōgarashi. These S-30 tōgarashi are harvested in the summer. The crop is rinsed with sea water, ground with yuzu and kōji mold, then left to ferment in barrels. In June or July, prior to the onset of peak summer heat, the barrels of fermenting tōgarashi are exposed to the air. This takes place from August until November. During the coldest part of the year, typically around 20 January, the tōgarashi are then laid out on snow to dry for several days in a traditional process known as kanzarashi [ja] or yukisarashi (Japanese: 雪さらし). This is repeated several times until March. Exposure to the snow increases the potency of the tōgarashi's flavor and removes excess salt and bitterness. This process is repeated each year, after which the kanzuri is bottled and shipped to market.

Different varieties of kanzuri may take longer to ferment, with one variety taking as long as six years.

Kanzuri was trademarked by Kanzuri, Co. Ltd. of Myōkō, Niigata in 1966, who later also trademarked the name in China, South Korea, and the United States. They are the exclusive makers of kanzuri.

Traditionally, people from the Jōetsu region, which is known in Japan for its heavy snowfall, used kanzuri as a condiment that was thought to help warm up body temperature.

Today, kanzuri is used in a wide variety of dishes, including ramen, miso soup, yakiniku, nabemono, nattō, and pasta. It can also be dissolved into wasabi or tare, as well as be eaten as a complement to tsukemono. It is also used as a seasoning in snacks including kaki no tane, senbei, Kappa Ebisen, instant yakisoba, ramen, and chorizo.