The digital retailer is offering eight albums Lennon recorded between 1969 and his slaying in 1980, as well as "Anthology," "Milk and Honey" and "Working Class Hero," Variety reported Wednesday.
"John would have loved the fact that his music will now be available in a format suited to a new generation of listeners," his wife, Yoko Ono, said in a statement.
Apple's online music store has been offering the solo works of Paul McCartney since May. Ringo Starr's post-Fab Four work is scheduled for an Aug. 28 delivery.
Lennon's tracks do not carry digital rights management software. On Tuesday, the first day of their availability, live recordings of "Lucy in the Sky With Diamonds" and "I Saw Her Standing There" plus the 1974 hit single "Whatever Gets You Through the Night" were the top sellers.
Only the solo work of the late George Harrison lacks digital distribution.