Nikki Dial (born Nicole Grenier on October 5, 1973 in Erie, Pennsylvania) is an American porn star active during the early 1990s.

Dial was known for her "girl next door" looks, large clitoris and breasts that were large for her small frame. Before entering the porn business, she worked in bondage and BDSM-oriented clubs; she claims that work of this nature helped her to overcome her natural shyness.

Although she retired after only two years and roughly seventy five movies, she worked for many of the major adult studios, including Legend, VCA, and Vivid. She won several awards during her adult film career, including ones from The X-Rated Critics Organization (XRCO) and Adult Video News (AVN). Her work included standard intercourse, oral and anal sex, lesbian encounters, and use of sex toys.

Dial retired from adult films around 1995 but she still occasionally appears as a feature dancer. She has also done voice acting in English-dubbed hentai anime.