Seven of the new cases are in the northern province of Bac Ninh, three in Hanoi's locked down K Hospital, two in Lang Son, two in Nam Dinh and one each in Thai Binh and Hung Yen.
The seven cases in Bac Ninh are all close contacts of previously confirmed coronavirus cases.
The three cases in Hanoi's K Hospital are two medical workers and a patient, who have now been quarantined right inside the hospital.
The two cases in Lang Son are a 42-year-old man and a 17-year-old girl, both close contacts of a confirmed coronavirus cases. They are being treated at the Huu Lung District medical center.
The two cases in Nam Dinh are a 49-year-old woman and a 53-year-old man, both close contacts of confirmed coronavirus cases. The woman is treated at the Y Yen District medical center, and the man at the Giao Thuy District medical center.
The case in Thai Binh is a 53-year-old man who made contact with confirmed coronavirus cases. He's being treated at the Thai Binh Lung Hospital.
The case in Hung Yen is a 46-year-old woman who made contact with a coronavirus case. She's being treated at the National Hospital for Tropical Diseases.
Vietnam's new Covid-19 wave has seen 729 local cases recorded in 26 cities and provinces since April 27.
Over 959,000 people have been vaccinated against Covid-19 so far.