Mitch Kupchak's wife is calling quits on the couple's 30-year marriage ... the Charlotte Hornets exec's wife has filed for divorce.
Claire Kupchak filed the docs in Los Angeles on Monday, TMZ Sports has learned.
In the documents, Claire cited "irreconcilable differences" as the grounds for the split. She marked Oct. 21 as the date of separation. She's asking for spousal support.
Mitch and Claire initially got hitched way back in August 1992 ... and had two children together. Tragically, their daughter, Alina, died in 2015 after battling an illness.