Jane Lynch is a woman of her word ... a month after announcing her marriage to wife Lara Embry was over, the actress has filed for divorce.

Jane just filed the docs in L.A. County Court, citing "irreconcilable differences." The 52-year-old "Glee" star met 44-year-old Embry back in 2009 at a fundraiser in San Francisco. They were married a year later in Massachusetts and registered for a domestic partnership in California soon after.

According to the doc, Jane and Lara have been separated since February. There are no minor children.

In the doc, Jane says she wants to terminate the court's jurisdiction to award Lara spousal support.

Sources connected to the couple have told TMZ they do NOT have a prenup, which means they can expect a 50/50 split of all marital assets ... but that will all be determined later.