Big Sisters and Little Sisters dancing together at Big Sister Association of Greater Boston's annual summer picnic on Boston's Long Island

Our Mission Statement

We ignite girls' passion and power to succeed through positive mentoring relationships with women and enrichment programs that support girls' healthy development.

Big Sister and Little Sister at a Boston Red Sox game, sponsored by Highland Street Foundation's Highland Hitters program.

Become a Big Sister today.

It isn't about being perfect. It's about being present. Find out how to become a Big Sister today.

Volunteers waiting at the starting line to ride bikes for miles throughout Southeastern Massachusetts to benefit girls mentoring programs

Get Involved.

You don't have to be a mentor to make a difference. Join thousands of men and women supporting Greater Boston's girls through volunteerism and philanthropic contributions.

Woman with coffee and jump rope helping girls jump and play together

Enroll a girl today.

If you want your daughter to have a Big Sister, enroll today with our simple online application.

Annual Gala: Big in Boston

Go behind the scenes at our signature event with a recap and photo gallery from Big in Boston 2015 in our News section.

Winter Coat Drive
Give the gift of warmth to a girl waiting to be matched with a Big Sister.

News & Events


What Big Sister Means to Me

Hear what Big Sister means to the women and girls in our mentoring programs. Thank you, FleishmanHillard for creating this inspiring video! Help us get #Girls2Great.


Big Sister raises 85% of our annual revenue through private philanthropy; your donation is critical.


At Big Sister Boston, we continue to use our collective voice to speak out on issues impacting girls and women. Read staff and Advisory Board member Margot Phelps' Letter to the Editor of The Boston Globe on the highly-publicized trial involving two students at St. Paul's School.