"Day After Day" is a song by the British rock band Badfinger from their 1971 album Straight Up. It was written by Pete Ham and produced by George Harrison, who also plays slide guitar on the recording. The song was issued as a single and became Badfinger's biggest hit, charting at number 4 in the United States and number 10 in the UK, ultimately earning gold accreditation from the Recording Industry Association of America.

Badfinger were a British rock band formed in 1961 in Swansea, Wales. Their best-known lineup consisted of Pete Ham (guitar), Mike Gibbins (drums), Tom Evans (bass), and Joey Molland (guitar). They are recognised for their influence on the 1970s power pop genre. It is estimated that the band sold 14 million records.