Mount Tandikat, Stratovolcano in West Sumatra, Indonesia

Mount Tandikat is a 2,438 m active stratovolcano in West Sumatra, 7.5 km from Padang Panjang. It is the twin of Mount Singgalang to its north-north-east, but only Tandikat has recorded historical eruptions. Its summit holds three craters, named A, B and K, and the mountain stretches north to south, with Lake Maninjau to the west.

Mount Tandikat is a Quaternary stratovolcano built largely from andesite lava flows, with early eruptions around 52,000 years ago producing hornblende-hypersthene pumiceous tuff. It has two magma chambers, a shallow one about 5 km deep and a deeper one of unknown depth. On 30 April 2009 a magnitude 7.6 earthquake triggered a large debris avalanche on its slopes, the most extensive of many landslides that day, killing hundreds of people.

The Minangkabau name Tandikek is paired with the title Puncak Tri Arga, "supporter of the Minang sky", shared with Singgalang and Marapi. Climbers on the Singgalang Ganting route often spend the night in the village of the mountain's kuncen, its traditional guardian, before setting out the next morning.

The usual route starts from Lembah Anai Resort, where a trail was opened in 1998 by a Mapala Unand team; it took them five days up and two down. Paths are faint or broken, leeches are common between 650 and 1,700 m, and a guide is needed to avoid getting lost. The Singgalang Ganting village route begins after a stay with the mountain's kuncen.

The 30 April 2009 earthquake, magnitude 7.6, triggered the largest of many landslides on Tandikat's slopes; loose pumice and 30–50 degree gradients let the flank flow downhill and hundreds of people died. The mountain's andesite lavas come from two magma chambers, a shallow one about 5 km down and a deeper one of unknown depth.