Emergency services were called to Greenfield Park in Eskbank Street at around 8.15pm on Friday, May 31 to a report of a disturbance and found a 16-year-old male seriously injured.
He was rushed to Queen Elizabeth University Hospital where he remains in a critical condition.
A 13-year-old boy was also taken to hospital for treatment.
Police said he has been arrested in connection with the incident.
An investigation has been launched and there will be a significant police presence in the area while enquiries continue.
Anyone with information is asked to approach these officers or contact Police Scotland via 101.
A Police Scotland spokesperson said: “Around 8.15pm on Friday, May 31, 2024, we were called to a report of a disturbance in the Cranhill area of Glasgow.
“Emergency services attended Greenfield Park in Eskbank Street and found a 16-year-old male seriously injured.
“He was taken to the Queen Elizabeth University Hospital where medical staff describe his condition as critical.
“A 13-year-old male youth was also taken to hospital for treatment.
“He has been arrested in connection with the incident.
“Enquiries are ongoing and there will continue to be a significant police presence in the area while officers carry out an investigation.
“Anyone with concerns or information can approach these officers or contact Police Scotland on 101.”