Ivanka Trump was booed as she defended his father's attitude towards women and hailed him as a "tremendous champion of supporting families".
The first daughter faced jeers from an unsympathetic audience as she attended the G20 women's summit in Berlin alongside German Chancellor Angela Merkel, IMF head Christine Lagarde and others.
Trump, 35, was participating in a panel discussion about female entrepreneurs when people in the crowd booed and hissed as she praised her father, US President Donald Trump.
The president, who made obscene remarks in old footage that emerged during last year's election campaign, has frequently faced criticism over his attitude towards women.
His daughter, who is an informal adviser at the White House, told the summit on Tuesday that she wanted to use her influence over her father to help empower women.
She said: "I'm listening, I'm learning, I'm defining the ways in which I think that I'll be able to have impact.
"I'm seeking the counsel ... of informed and thoughtful women and men and I'm really striving to think about how best to empower women in the economy, both domestically and across the globe."
But she faced jeers from the audience when she called her father a "tremendous champion of supporting families and enabling them to thrive", with the moderator moving the discussion on amid the chorus of boos.
Trump finds herself in a rare situation as it's unusual for a president to appoint a family member as an adviser with access to classified information.
Critics claimed the appointment violated federal nepotism laws, but the Justice Department ruled that the laws don't apply to the president's choice of advisers.
Trump said last month she is serving in an unpaid, informal role.
In the video that surfaced during the campaign the president boasted about grabbing women's genitals.