In two incidents, victims were lured to Queens Park, where one person was critically injured on May 8 and another seriously hurt on May 10 in unprovoked attacks. There were also two other attacks that weekend.
Police have not revealed the gender of the victims or the apps used.
In a statement last night, police said the males — two 15-year-olds and two aged 16 — had each been charged with aggravated burglary following an intensive investigation.
Invercargill City Mayor Tom Campbell said he was "absolutely delighted" by the development.
"It’s great that police have taken the matter so seriously and have made arrests so quickly."
The four will appear in the Invercargill Youth Court on Friday.
Southland area prevention manager Acting Inspector Mel Robertson said inquiries had established there were four separate incidents where dating apps were deliberately used to lure victims to various locations, with the intent of violently assaulting them.
"This offending was deliberate, co-ordinated and extremely dangerous.
"The level of violence inflicted is deeply concerning, and it is nothing short of luck that the victims were not more seriously injured.
"The reality is stark — one more strike, one more kick and the outcome could have been fatal."
Police last week warned people not to share videos that had emerged after the Queens Park attacks.
Acting Insp Robertson said police were continuing their investigation and further arrests and charges were expected.
"We are urging the public to take care when engaging with people online and to report any suspicious behaviour immediately. If you have information, come forward. You will help prevent further harm."
Acting Insp Robertson acknowledged the investigation team "who have worked tirelessly to identify and apprehend those responsible in a very short period of time".
"Their commitment has ensured swift accountability for those involved."
Police remained committed to protecting the community and would pursue anyone involved in this type of offending.
"If you think this behaviour is a game or a trend, you are wrong. The consequences are real — and police will hold you to account." — Allied Media
