Liberal MP Andrew Laming has apologised to two Brisbane women who accused him of online abuse.
Dr Laming conceded his social media commentary had caused significant distress to two highly respected members of his federal electorate.
The exchanges sparked accusations of slander, stealing and stalking.
Dr Laming has apologised to both women in writing and during a speech to parliament.
"I want to express my regret and deep apologies for the hurt and the distress that communication may have caused," he said on Thursday.
"I want to retract those comments and issue a public unreserved apology."
The Queensland backbencher, who regularly attracts criticism for his behaviour and comments on social media, acknowledged he had lessons to learn about his use of words.
"I have made a concerted effort to understand the impact of these responses upon others and demonstrate a clear change in the way I communicate," he said.
"I want to say to any person who has received correspondence from me which fell short of what they expect from an MP that I intend to own that failure and apologise without hesitation."