"Mamaw's House" is a song by American country music singer Thomas Rhett featuring Morgan Wallen.

It was released on September 29, 2023, through Big Machine, and serves as the lead single from 20 Number Ones.

The song is a fan-favorite and previously unreleased track that was first teased over three years before its actual release.

Accompanied by a picture of him as a child at his grandmother's home, Rhett posted a lyric of the song as a caption.

This distinction also tied Rhett with Brooks & Dunn, Toby Keith and Brad Paisley for the ninth most number-one singles.