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• Want to save a life? Sign up for your state's donation registry through OrganDonor.gov.
• Use Goodsearch.com's Yahoo!-powered search engine every time you browse the Web, and you'll automatically give to a nonprofit like the American Cancer Society.
• Donate hotel loyalty points and airline miles on Wish.org to help the Make-A-Wish Foundation grant requests to children with life-threatening conditions.
• Play crossword puzzles at Charitii.com, and the site's sponsors will make a contribution to one of five charities for each correct answer.
• Re-gift the blender and other household goods you didn't ask for to a local firehouse (call ahead), so first responders can make their living quarters feel like home.
• Mail a letter of appreciation or a holiday card to a member of the military through AMillionThanks.org.
• Gather your old cell phones and laptops for donation to the National Coalition Against Domestic Violence, which will resell them to fund outreach programs.
• Download the Charity Miles app and go for a run, walk, or bike ride; you can earn up to 25 cents per mile for nonprofits, including Autism Speaks and Stand Up to Cancer.
• Bring a little TLC to neglected public spaces in your town by organizing volunteers to pick up garbage. Use social media to spread the word about your "Trash Mob."
• Explain why Horton hears a Who, as a United Way volunteer reader, mentor, or tutor for elementary schoolchildren.
• Assemble gift bags for Cheerful Givers, a nonprofit that distributes birthday presents to kids at food pantries and shelters.
• Give a pint of blood; during the holidays, donations can be nearly 60 percent below average. Make an appointment at RedCrossBlood.org.
• Head to a soup kitchen, where you can greet and seat guests, bus tables, wash dishes, or prepare and serve meals. Look for one at FoodPantries.org.
• Run errands for the elderly or shuttle them to and from doctors' appointments. Find a neighborhood senior center through the National Council on Aging.
• Help the Salvation Army staff sort through donated clothing. (They receive more than 300 million pounds a year.) Find a branch at SalvationArmy.com.
• Round up a few funny or uplifting DVDs and host a family movie night at your local Ronald McDonald House. (There are 176 locations throughout the country.)
• Show off your fashion sense by helping disadvantaged women choose job-interview outfits through Dress for Success.
• Go to Habitat.org to sign up for a shift with Habitat for Humanity, which needs volunteers of all skill levels to build homes for low-income families.
• Host a board game party for adults with developmental disabilities at a group home in your area. Find one through the advocacy organization The Arc.
• Help the homeless find places to get warm. Check Volunteers of America for opportunities at shelters in your town.
More Ways to Help
From the December 2013 issue of O, The Oprah Magazine
We Hear You!