Kaldbukta is a bay in Van Mijenfjorden in Nordenskiöld Land at Spitsbergen, Svalbard. The bay has a width of about 11.5 kilometers. The large valley Reindalen ends into Kaldbukta. The largest river flowing into the bay is Reindalselva, and also Semmeldalselva and Kalvdalselva ends in Kaldbukta.[1]