January Kristen Jones (born January 5, 1978) is an American actress and model, best known for portraying the role of Betty Draper in Mad Men (2007–2015), for which she was nominated for two Golden Globe Award for Best Actress – Television Series Drama and a Primetime Emmy Award for Outstanding Lead Actress in a Drama Series.

Since 2015, she has been starring as Melissa Chartres in The Last Man on Earth. She also starred in the films American Wedding (2003), We Are Marshall (2006), Unknown (2011), Seeking Justice (2011) and X-Men: First Class (2011).