Zōni (雑煮 or ぞうに), often with the honorific "o-" as o-zōni, is a Japanese soup containing mochi rice cakes.

Formerly, amongst samurai society, the dish was referred to as "烹雑" (Hōzō) with 烹 also being an archaic term for "to simmer" or "to boil".

It is thought to be a meal that was cooked on field battles, boiled together with mochi, vegetables and dried foods, among other ingredients.

It is also generally believed that this original meal, at first exclusive to samurai, eventually became a staple food of the common people.

Zōni was first served as part of a full-course dinner (honzen ryōri), and thus is thought to have been a considerably important meal to samurai.