Tsunami (jam'i: tsunamis ko tsunami; daga Jafananci: 津波, lit. "hawan tashar jiragen ruwa"; Turanci pronunciation: /tsuːˈnɑːmi/), wanda aka fi sani da raƙuman ruwa na teku ko raƙuman ruwa, jerin raƙuman ruwa ne a cikin ruwa wanda ya haifar da sauyawar ruwa mai yawa, gabaɗaya a cikin teku ko babban tafki. Tsunamis na iya haifar da girgizar ƙasa na karkashin ruwa kamar tsunami na ranar 2004 na Boxing Day, ko ta hanyar girgizar ƙasa kamar ta 1958 a Lituya Bay, Alaska, ko kuma fashewar dutsen mai fitad da wuta kamar fashewar tsohuwar Santorini. A ranar 11 ga Maris, 2011, guguwar tsunami ta auku kusa da birnin Fukushima, a ƙasar Japan
kuma ya yada ta cikin tekun Pacific.