Helen Morlok (born May 19, 1930 in Lansing, Michigan, died October 31, 2003 in Lansing, Michigan) is one of the four sisters listed in the Guinness Book of World Records as the world's oldest identical quadruplets.
The McNicholas Quadruplets (Lindsay, Ryan, Brynn, and Connor) were the third set of quadruplets born in the state of Minnesota.