I Don't Know Why

{{short description|1969 single by Stevie Wonder}}

{{about|the song by Stevie Wonder|the popular standard written in 1931|I Don't Know Why (I Just Do)|the song by Clarence Henry|(I Don't Know Why) But I Do|the 1989 song|I Don't Know Why I Love You (The House of Love song)}}

{{Use mdy dates|date=September 2020}}

{{Infobox song

| name = I Don't Know Why

| cover = idon'tknowwhystevie.jpg

| alt =

| type = single

| artist = Stevie Wonder

| album = For Once in My Life

| A-side = My Cherie Amour

| released = January 28, 1969

| recorded = 1968

| studio =

| genre = Soul, pop

| length =

• 3:02 (single version)
• {{Duration|2:48}} (album version)

| label = Tamla

| writer =

• Stevie Wonder
• Paul Riser
• Don Hunter
• Lula Hardaway

| producer =

• Don Hunter
• Stevie Wonder

| prev_title = Shoo-Be-Doo-Be-Doo-Da-Day

| prev_year = 1968

| next_title = My Cherie Amour

| next_year = 1969

}}

"I Don't Know Why" (sometimes listed as "Don't Know Why I Love You") is a song by American singer-songwriter Stevie Wonder, from the 1968 album For Once in My Life. It was released as a single on January 28, 1969, with "My Cherie Amour" on the B-side. A few months later, the single was re-issued with sides reversed because of the growing popularity of "My Cherie Amour", which became a Top Ten hit.{{cite book |last=Betts |first=Graham |date=2014 |title=Motown Encyclopedia |pages=414–415 |publisher=AC Publishing |isbn=9781311441546}}

Cash Box stated that "Wonder is softened just a trifle on this slower and more dramatically developing ballad."{{cite news|title=CashBox Record Reviews|date=February 15, 1969|page=20|accessdate=2021-12-08|url=https://worldradiohistory.com/Archive-All-Music/Cash-Box/60s/1969/CB-1969-02-15.pdf|newspaper=Cash Box}}