Namtok Kaeng Sopha is a waterfall and tourist attraction in Wang Thong district of Phitsanulok Province in Thailand. Situated in Thung Salaeng Luang National Park on the Wang Thong River off of Lomsak Road (Highway 12), between kilometers 71 and 72, it is the largest waterfall in Phitsanulok.
Kaeng Sopha is a tiered waterfall, shaped like a stairway, and it has been dubbed the Niagara Falls of Thailand. The torrents are very strong in the rainy season. The vapor rising in the area creates a vast rain-like curtain. There are no concessions sold in the park. Kaeng Sopha is the subject of a June, 2007 postage stamp in Thailand in the Thailand Waterfall series.