Matt Barnes is way behind on child support payments ... a judge just ordered him to fork over more than six figures in back payments to his ex-wife Gloria Govan.
According to new legal docs, obtained by TMZ, the former NBA baller owes Gloria $133,976.54 in past-due child support payments.
It appears Matt hasn't been shelling out child support for quite some time ... because as we first reported back in 2018, Matt's monthly child support bill was slashed from $20,000 to $7,500.