Kalgachia is a sub-urban town in Barpeta district, Assam, India. It is 17.5 kilometres (10.9 mi) west of the district headquarters Barpeta.

The total population is 6304 of which 3229 are males and 3075 females as per the 2011 census.

Nabajyoti College is a higher educational institution and G K Arabic College Madrassa is a higher educational institution in Kalgachia. There are many private institutions in this place. Ataur Rahman College of Education and B.B. College are another two institutions close to this town. Epitome Computer Institute is the oldest and only certified computer education establishment and A large number of good quality English Medium Schools are Al-Ameen Academy. K.K.Pathak High School is one of the oldest schools in this town. A new college started (2018) named Ajmal College of Arts & Science. Kalgachia Commerce College is the only commerce college in this town but this college is shifted to Dewkura. There is only one private institution of commerce at present which is Wisdom Academy Kalgachia (A Junior College of Commerce). It has been established only for women's education at Lokpriya Girls College, located in Dimapur. Some private sector schools in this town are Radiance Academy and Royal Global English School., Fakaruddin Ali Ahmed Junior College, Eden Academy and Assam Techno School.

Kalgachia is located 14 km south of National Highway 27 and is well connected by road with Sarbhog and nearby towns. The nearest railway stations are Sorbhog Railway Station and Barpeta Road Railway Station the nearest airport is Lokpriya Gopinath Bordoloi International Airport. Now Kalgachia is connected with district headquarters in Barpeta within 20 minutes with the help of the New Beki bridge completed in 2019.

• Fakhruddin Ali Ahmed, former president of India
• Abdul Khaleque, former MP of the Indian Parliament and former MLA of Assam Legislative Assembly
• Rafiqul Islam, MLA of Assam Legislative Assembly