Robert Mark "Rob" Marciano (born June 25, 1968) is an American journalist and meteorologist who gained prominence as a meteorologist and occasional reporter and substitute anchor for CNN Worldwide in their Atlanta headquarters.
Before joining CNN in May 2003, he served as chief meteorologist for KATU-TV and 750 KXL News Radio in Portland, Oregon. From 1994 to 1997, he worked as morning and then chief meteorologist for KPLC-TV in Lake Charles, Louisiana and later served as a weather anchor for WVIT Connecticut News 30 in West Hartford, Connecticut.
On November 12, 2012, the producers of Entertainment Tonight announced that Marciano would become its new co-anchor in January 2013, ending a months-long search for a permanent replacement for Mark Steines. Marciano bid farewell to CNN viewers on Early Start and Starting Point on December 21, 2012.
On July 19th, 2014, ABC News announced that Marciano will become their senior meteorologist. Marciano will join Good Morning America Weekend and report on the latest weather headlines throughout the week as well as partner with Ginger Zee and the Extreme Weather Team for weather coverage across all ABC News broadcasts and platforms.  His final co-hosting of Entertainment Tonight came on Wednesday, August 27, 2014.
- cynthia (September 7, 2004). "Rob Marciano General Info". Rob Marciano / Yahoo Fan Club Weathering Heights. Retrieved May 16, 2013.
- "CNN Programs - Anchors/Reporters - Rob Marciano". CNN.com. Archived from the original on February 21, 2013.
- 3/4 italian 1/4 german Rob Marciano on Twitter. July 25, 2012. Retrieved May 16, 2013.
- Rose, Lacey (November 12, 2012). "'Entertainment Tonight' Names CNN Vet Rob Marciano as New Co-Anchor (Exclusive)". The Hollywood Reporter. Retrieved May 16, 2013.