Kogin Thames babban kogi ne da ke ratsa kudancin Ingila. Shine kogi mafi tsayi gabaɗaya a Ingila kuma na biyu mafi tsayi a Ƙasar Ingila. Sunan "Thames" ya fito ne daga tsohuwar kalmar Celtic ma'ana "duhu" ko "laka", wanda ya dace kamar yadda kogin yana da launin ruwan kasa saboda lakaran da yake ɗauka. Kogin ya kasance wani muhimmin fasali na shimfidar wuri da al'adun yankin, kuma ya taka muhimmiyar rawa a tarihin Ingila.