Nandini Jammi (born 1988 or 1989) is an American activist and brand safety consultant. She is a co-founder of the Check My Ads agency and associated non-profit Check My Ads Institute. Previously, she co-founded Sleeping Giants. She is active in informing businesses that their advertisements are appearing on conservative websites that she describes as bad faith publishers—websites that publish misinformation or conspiracy theories, or engage in advertising fraud—and pressuring them to stop supporting those publishers.