There are three banks on Lanta. 2 of them in Saladan (Siam Commercial Bank, Thanachart Bank) almost opposite each other in the main shopping area in Saladan. Krung Thai Bank is in the middle of Klong Dao (at the entrance of Southern Lanta Resort)

There are ATMs at all the 7 Elevens and some other convenience stores, throughout the island.

Klong Dao - there are two 7 Eleven. One at the PTT petrol station (no alcohol) and one accross the road at the entrance to Royal Lanta Resort.

Long Beach - the 7 Eleven is at the southern end and there is  also a free-standing ATM opposite Opium 

Klong Khong Beach - there is a conveience store with ATM at the northern end

Klong Nin - There are two ATMs across from Klong Nin Minimart.There is also an ATM at each of the 2 Klong Nin 7-11s, the first being near the intersection which leads to Old Town and the other across the road from the Rawi Warin Resort.

Kantiang Bay - There are 2 ATMs at the 7-11 (SCB and Bangkok Bank) and a Thai Military Bank ATM at the Jinda Tour Office opposite the Lanta Marine Park View driveway on the main road.