Three Weeks With Lady X is a historical romance written by Eloisa James and published in 2014. It was a New York Times Bestseller and was nominated for two Romantic Times awards.
The novel is considered a Regency romance, with much of the conflict revolving around the societal expectations of the time. In a departure from other novels of this type, James gave her heroine an occupation. Her interior decorating skills were inspired by James' love for HGTV. The hero is also unusual for the time period, being neither a lord nor legitimate. The primary and the secondary characters are richly drawn and fully developed. The novel is considered very sensual, and marked James' first foray into more explicit love scenes.
The hero was first introduced as a child in James' 2009 work This Duchess of Mine. The protagonists have secondary roles in James's next book, Four Nights With a Duke.