| Chathamattom | |
| Native Name: | ചാത്തമറ്റം |
| Subdivision Name2: | Ernakulam |
| Pushpin Map: | India Kerala#India |
| Coordinates: | 10.022°N 76.727°W |
| Utc Offset: | +5.30 |
| Timezone1: | IST |
| Subdivision Type3: | Taluk |
| Subdivision Type2: | District |
| Subdivision Type1: | State |
| Subdivision Type: | Country |
| Subdivision Name3: | Kothamangalam |
| Subdivision Name1: | Kerala |
| Postal Code: | 686671 |
| Subdivision Name: |  India |
| Settlement Type: | Village |
| Postal Code Type: | PIN code |
| Population Total: | 8221 |
| Population As Of: | 2016 |
| Registration Plate: | KL 44 |
| Area Total Km2: | 21.22 |
| Area Code: | 0485 |
Chathamattom (ml|ചാത്തമറ്റം), also known as Chathamattam, is a village in Ernakulam District, Kerala, India. It is located in the Paingottoor gram panchayat. Chathamattom is 4 kilometres away from Paingottoor.
Agriculture is the main occupation of people. Ginger, turmeric, coconut, cocoa, paddy, black pepper (Idukki Gold or black gold), plantain, pineapple and tapioca are commonly cultivated. The main production and staple food is rice. The nearest towns are Kothamangalam, Muvattupuzha, and Thodupuzha.
An attractive environmental sightseeing place in Chathamattom is "Pothencheeni Kunnu" (a hill above 300 meters high). The distant view of the metro city Kochi from here gives an amazing vibe and makes it a good place for trekking.
Chathamattom is a place of historical importance. The ordnance factory of the ancient kingdom (Thrikkariyoor-the oldest capital of Chera Dynasty) was situated here. At that time Chathamattam was known as Shasthavumattam. Black melted stones or dross (Malayalam: keedon kallukal) broken into pieces when thrown in the fire are commonly in some dry lands here is evidence for an ordnance factory.