Nadya Teresa Okamoto (born February 11, 1998) is an American social entrepreneur who is the founder and former executive director of the non-profit organization Period Inc.,[1] which distributes menstrual hygiene products and advocates for ending what is known as the tampon tax.

[3][4] The company also built Ask August, an educational "judgement-free platform" that "makes it easier for Generation Z to navigate the process of menstruation.

[18][8] In December 2014, Okamoto founded Period Inc. with her high school classmate Vincent Forand, originally under the name Camions of Care.

[1] The organization distributes menstrual hygiene products, has campus chapters at universities and high schools around the United States, and advocates for ending what is known as the tampon tax.

Less than seven months later, Okamoto announced her candidacy for Cambridge City Council, with a campaign team primarily composed of other Harvard students.

She was the youngest candidate in the race and focused her campaign on issues of affordable housing, education equity, and climate change.

[2] Period Inc. later released a report on the allegations that summarized the consequences of the organization's rapid growth and visibility, which noted that Okamoto was working with a transformative justice group on accountability.

[31] In November 2020, Okamoto co-founded the lifestyle period brand August with Nick Jain, the founder of Juv Consulting.