Chkalov Island (Остров Чкалова; Ostrov Chkalova), formerly Udd Island (Остров Удд), is a coastal island in the southern end of the Sea of Okhotsk. It is located off Schastya Bay, between the shorebound lagoon and the sea. Baydukov Island lies only 2 km off its east-southeast tip.
Chkalov Island is long and narrow. It is 20.5 km long and has an average width of 1 km.
This island is a natural habitat for many birds, like the great knot, red-necked stint, dunlin, whimbrel, bar-tailed godwit and the common sandpiper. Beluga whales are common off its northern waters.
Administratively Chkalov Island belongs to the Khabarovsk Krai of the Russian Federation.