"I Can't Tell You Why" is a song by the American rock band Eagles that appeared on their 1979 album The Long Run.

"[7] Schmit said: "I had some writing sessions with Don and Glenn and I threw out a bunch of my ideas and that one [for "I Can't Tell You Why"] stuck.

Schmit also performed "I Can't Tell You Why" while on tour as a member of Ringo Starr & His All-Starr Band in 1992.

Cash Box said that "Schmit’s aching, near-falsetto vocal here adds immeasurable depth to the haunting quality of this love song, with a tastefully sparse instrumental.

"[10] Record World said that "Tim Schmidt, the newest Eagle, lends his sweet falsetto and writing talents to this pretty love ballad.

[13] Ultimate Classic Rock critic Sterling Whitaker rated it as the Eagles 5th most underrated song, praising Schmit's "beautiful falsetto" and Frey's "melodic" guitar solo.