Winnie Ruth Judd (January 29, 1905 – October 23, 1998), born Winnie Ruth McKinnell, also known as Marian Lane, was a medical secretary in Phoenix, Arizona, who was accused of murdering her friends, Agnes Anne LeRoi and Hedvig Samuelson, in October 1931. The murders were discovered when Judd transported the victims' bodies, one of which had been dismembered, from Phoenix to Los Angeles, California by train in trunks and other luggage, causing the press to name the case the "Trunk Murders". Judd allegedly committed the murders to win over the affections of Jack Halloran, a prominent Phoenix businessman.

Judd was tried for LeRoi's murder, found guilty, and sentenced to death. However, the sentence was later repealed after she was found mentally incompetent, and she was committed to the Arizona State Asylum for the Insane (later renamed the Arizona State Hospital). Over the next three decades, Judd escaped from the asylum six times; after her final escape during the 1960s, she remained at large for over six years and worked under an assumed name for a wealthy family. She was ultimately paroled in 1971 and discharged from parole in 1983.

Judd's murder investigation and trial were marked by sensationalized newspaper coverage and suspicious circumstances suggesting that at least one other person might have been involved in the crimes. Her sentence also raised debate about capital punishment.