Wat Thawin Sila Mongkhon is a Buddhist temple of the Mahanikaya order located in Chachengsao. The most prominent feature of Wat Thawin Sila Mongkhon is the large Buddha statue known as Luang Pho Samritphon Thanjai.

It is reportedly 14 metres tall and sits on an elevated platform at the back of the temple's courtyard. Another striking feature is this reclining yak—or giant—with a green complexion and wielding a club.