Opal Muriel Marble
- Born: 17 Jan 1907, Oak Grove, Jackson County, Missouri
- Marriage: Robert Granville Neill
- Died: 4 Mar 1993, Kingsville, Johnson County, Missouri at age 86
Noted events in her life were:
• Census, 1910, Missouri, Jackson County, Van Buren Township, District 0215, Image 13 of 19. Age 3 yrs.
• Census, 1920, Missouri, Jackson County, Van Buren Township, District 282, Image 1 of 18. Age 13 yrs.
Opal married Robert Granville Neill, son of Charles Alexander Neill and Laura Belle Meeks. (Robert Granville Neill was born on 2 Jul 1903 in Sibley, Missouri and died on 17 Apr 1972 in Clinton, Henry County, Missouri.)