Jean Acker, born Harriet Ackers on October 23, 1892, in Trenton, New Jersey, was an American actress whose career spanned from the silent film era through the 1950s. She was best known as the estranged wife of silent film star Rudolph Valentino. Raised on a farm, she  became an expert horsewoman and attended St. Mary's Seminary in Springfield, New Jersey.

Her parents, Joseph and Margaret Ackers, divorced when she was young, and her father remarried twice, managing several businesses in the Philadelphia area.

Her acting career began in vaudeville before she moved to California in 1919. She quickly became the protégé and lover of actress Alla Nazimova, which helped her secure a $200 per week contract with a movie studio.

Jean Acker appeared in numerous films during the 1910s and 1920s, but by the early 1930s, she began taking smaller, often uncredited roles. Her final on-screen appearance was in the 1955 film "How to Be Very, Very Popular," opposite Betty Grable.

Her personal life was marked by her brief marriage to Rudolph Valentino. They married on November 6, 1919, but Jean locked him out of their hotel room on their wedding night, and the marriage was never consummated.

They divorced in 1923, but she continued to use the name Mrs. Rudolph Valentino, even suing for the legal right to do so. Despite their tumultuous relationship, they reconciled their friendship before Valentino's death in 1926. She was one of the last people to see him alive and attended his funeral.

Throughout her life, she had relationships with several women, including Grace Darmond and Chloe Carter, with whom she lived until her death.

Jean Acker passed away on August 16, 1978, in Los Angeles, California, at the age of 85. She and Chloe Carter are buried side by side in Holy Cross Cemetery.