Niloy Chakrabarty Neel was killed in his flat on the fourth floor of a building at North Gorhan in Dhaka around 1:45 pm on Friday, reported Bdnews24.com.
According to reports, five assailants armed with machetes entered his flat in two groups posing as potential tenants after the Juma prayers.
Niloy, who was living with his family in the flat, is the fourth blogger in Bangladesh to have been murdered in 2015.
"Niloy was an activist of the platform that is demanding a ban on Islamist parties and the maximum punishment for 1971 war criminals," said Imran H Sarker, the Ganajagaran Mancha spokesperson.
In February, writer-blogger Avijit Roy was hacked to death near the Dhaka University, another blogger Oyasiqur Rahman Babu was killed a month later in the same style.
Secular blogger Ananta Bijoy Das was killed in May in Sylhet.
In May, terror group al-Qaeda's Indian offshoot claimed responsibility for the killing of secular bloggers in Bangladesh whom it described as 'blasphemers'.
All four bloggers killed were involved with the Ganajagaran Mancha.