Masik Krishna Janmashtami refers to the monthly celebration of Lord Krishna's birth on the eighth day (Ashtami) of the Krishna Paksha (waning phase of the moon) in the Hindu calendar month. "Masik" means monthly, and "Krishna Janmashtami" signifies the birth of Lord Krishna.

In Hinduism, Janmashtami is one of the most significant festivals celebrated with great enthusiasm and devotion across India and by Hindus around the world. It marks the birth anniversary of Lord Krishna, who is considered the eighth incarnation of Lord Vishnu. His birth is believed to bring peace, prosperity, and joy.

While the major Janmashtami celebration, known as "Sri Krishna Janmashtami," occurs once a year, the term "Masik Krishna Janmashtami" refers to the observance of Krishna's birth every month on the eighth day of the dark fortnight of the lunar month. Devotees often fast, perform special prayers, sing bhajans (devotional songs), and enact dramas depicting scenes from Lord Krishna's life during these celebrations.

However, the level of observance and festivities may vary regionally or based on individual traditions, with the annual Janmashtami celebration being the most widely recognized and celebrated.