"Time Marches On" is a song written by Bobby Braddock, and recorded by American country music artist Tracy Lawrence. It was released in March 1996 as the second single and title track from his album Time Marches On. It was the fifteenth chart single of his career. It spent three weeks at Number One on the Billboard country charts in mid-1996, becoming the longest-lasting Number One hit of his career. It also received a Single of the Year nomination from the Country Music Association in 1996, as well as a Song of the Year nomination for both 1996 and 1997.

The song is in a moderate tempo in the key of A major with a vocal range of A3-F♯5. It features three verses, with a bridge preceding the third. The introduction and interludes follow a chord pattern of A-F♯m for four measures. Each verse uses that same chord pattern for four measures, followed by D-Bm for two measures, two more A-F♯m measures, ending on Bm-F♯m-Bm-A. The bridge uses D-Bm twice, A-F♯m twice, D-Bm twice again, and ends on E-Bm-D-E-A. After the third verse, Lawrence sings the line "Time marches on" several times over the chord pattern F♯m-Bm-A.

Its lyrics detail various events in the lives of a married couple and their two children, starting with the children's young childhood, then moving through their adolescence and adulthood. In the bridge, the narrator observes that "the only thing that stays the same is that everything changes". By the final verse, the children have grown up and moved away, the daughter is now a single grandparent, the son is on a diet to control his high cholesterol, the mother is senile (possibly Alzheimer's) and the father has died. Each verse also references various items of pop culture.

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