Allen Iverson -- My Wife's 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.

TMZ broke the story ... 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.