Allen Iverson Calls His Wife A "Dirty Liar"

NBA legend Allen Iverson is calling BS on his estranged wife, who's trying to score a restraining order against him -- insisting he NEVER harassed her or her family.

Iverson just filed new legal docs in Fulton County, GA -- asking a judge to throw out Tawanna Iverson's bid for a protective order.

 Tawanna claims Allen "has engaged in increasingly contemptuous, threatening, and disturbing behavior" over the last few months ... and she's afraid things will get worse. Them's strong words.

A judge has yet to rule.