Grandpa & Grandma Longneck
Grandpa and Grandma Longneck, voiced by Bill Erwin, Kenneth Mars and Michael Gambon and Linda Gary and Miriam Flynn, are characters in the Land Before Time films and television series. They are each Apatosaurus, which is one of many species referred to as "Longnecks" by the characters in the franchise. They are Littlefoot's maternal grandparents - due to being the parents of his mother - and his primary caregivers after his mother's death. They act as parents to Littlefoot; giving him advice when needed, and take the responsibility of protecting him very seriously.

Their real names have not yet been revealed, as nearly everyone in the Great Valley refers to them as "Grandma and Grandpa Longneck"; even each other, and Topps (a.k.a. Mr. Threehorn) continually refers to Grandpa as "Longneck". Bron calls Grandpa "Papa Longneck".

In the LBT-Humanization Series, Littlefoot's Grandparents treat's all humans with royalty.