Sprague Elizabeth Grayden (born July 21, 1980 in Manchester-by-the-Sea, Massachusetts) is an American actress known for her roles in series such as 24, Jericho, and Sons of Anarchy. Grayden is the daughter of two teachers and has a brother named Benjamin.

She graduated cum laude from Barnard College, Columbia University, with a degree in American Studies. She was discovered by a talent scout at the age of five and appeared in commercials and plays.

Her best-known roles include: Olivia Taylor in 24: Twenty Four (season 7) – as the daughter of fictional US President Allison Taylor; Heather Lisinski in Jericho – one of the main roles in the post-apocalyptic series; Donna Winston in Sons of Anarchy – wife of Opie Winston; Kristi Rey in Paranormal Activity 2 and 3 – central character in the horror film series. She has also appeared in Six Feet Under, CSI: NY, Law & Order: SVU, The Following, and John Doe.

Since 2013, Grayden has been married to cinematographer Alexis Cassar, with whom she has a son (born in 2014).