Jack Tempchin is an American musician and singer-songwriter who wrote the Eagles song "Peaceful Easy Feeling" and co-wrote "Already Gone", "The Girl from Yesterday", "Somebody" and "It's Your World Now".

Jack Tempchin was born rural Ohio. His family moved to San Diego, California when he was 9 months old near Balboa Park. His father was an aspiring baseball player who moved the family to the city after World War II to be a milkman.

Tempchin always enjoyed music. He wasn't an outside kid, instead reading books about music. But when outside, he would make music. Jack was a whistler as a boy, whistling every song he could think of when walking around the city. He later learned the harmonica and did the same thing, learning every song he could while walking. Around this time, he also tried songwriting, whistling and playing the harmonica to write music.

Tempchin and fellow Eagles bandmate Glenn Frey became friends in 1972 before both became famous, when Frey was visiting San Diego.

At ages 18 - 20, Tempchin learned the acoustic guitar and piano, and started performing solo with his guitar, harmonica, and singing.

During the Eagles' breakup period (1980–1994) he co-wrote with Glenn Frey producing "You Belong to the City", "Smuggler's Blues", "The One You Love", "I Found Somebody", "Sexy Girl" and "True Love".

Tempchin wrote "Slow Dancing". The song was first recorded in 1976 by the short-lived group Funky Kings, of which Tempchin and Jules Shear were members at the time. In 1977, the song became a top-10 pop hit for Johnny Rivers titled as "Swayin' to the Music (Slow Dancing)", and in 1979 it was a top-10 country hit for Johnny Duncan.

Tempchin has also toured extensively as a solo artist over the years, opening for Ringo Starr, Jackson Browne, Dave Mason, Poco, Dolly Parton, Karla Bonoff, Chicago, Christopher Cross, Kenny Loggins, Timothy B. Schmit, Barry McGuire, Tom Rush, Al Kooper and Emmylou Harris.