Krishnapuram Palace, Palace museum in Kayamkulam, India.

Krishnapuram Palace is a palace and museum in Kayamkulam, Alappuzha district, India. The two-storey building has a white plaster lower section and a steep, red-tiled hipped roof, with a smaller tiled porch over the recessed entrance. It stands on a hillock within a 2.55-acre compound enclosed by a 10-foot wall, with a terraced garden, fountains, ponds and lawns.

King Anizham Thirunal Marthanda Varma had the palace built between 1729 and 1758 after defeating the neighboring kingdom of Odanad. The new building replaced an older structure on the same site.

The Gajendra Moksham mural covers 154 square feet (14.3 m2) on the western end of the ground floor, the largest single-panel mural found in Kerala. It is painted with entirely natural pigments. The palace also displays the double-edged Kayamkulam Vaal sword and a 10th-century Buddha statue in its courtyard.

The palace stands about 2 km south of Kayamkulam town, on the left of National Highway 66 between Ochira and Kayamkulam, 47 km from Alappuzha on the road to Kollam. Kayamkulam railway station is roughly 1.5 km from the town, and most trains from Ernakulam, Kottayam, Alappuzha, Kollam and Thiruvananthapuram stop there. The complex is enclosed by a 10-foot compound wall, and the museum is run by the Kerala State Department of Archaeology.

An underground water tank reaches into the center of the building and naturally cools the interior rooms. This old construction technique still keeps the temperature in the halls pleasantly low today.