John Lennon was inducted into the Rock and Roll Hall of Fame as a solo artist in 1994.
The induction recognized Lennon's post-Beatles career, including albums such as John Lennon/Plastic Ono Band and Imagine, as well as songs like “Imagine,” “Working Class Hero,” and “Instant Karma!” He had already entered the Hall of Fame as a member of the Beatles in 1988, so the two dates are sometimes confused.
Paul McCartney inducted Lennon during the 1994 ceremony, while Yoko Ono accepted the honor on Lennon's behalf. Lennon had died in 1980, twelve years before the solo recognition. His solo induction reflected not only his songwriting but also his political activism, peace advocacy, and influence on later generations of musicians.
A useful distinction is that 1988 refers to the Beatles’ induction, whereas 1994 refers specifically to Lennon's achievements as an individual artist.