Glory Johnson -- Pleads Not Guilty In Dom. Violence Case

Glory Johnson is digging in her heels in her domestic violence case -- pleading NOT GUILTY to assaulting her estranged wife, Brittney Griner ... TMZ Sports has learned.

Johnson was charged with assault and disorderly conduct stemming from a fight with the WNBA superstar at their Arizona home on April 22nd. Both Glory and Brittney were arrested.

Griner had previously struck a plea deal with prosecutors -- and pled down to disorderly conduct. She was ordered to complete a domestic violence counseling program.

But Johnson -- who plays for the Tulsa Shock -- has always maintained she was innocent ... and according to court docs filed on July 13th, pled not guilty to assault and disorderly conduct.

If convicted, Johnson faces up to 6 months in jail for each count.

Johnson is currently pregnant with twins -- and has split from Griner ... who filed for annulment just weeks after they were married in May.