Door into Summer (disambiguation)
The Door into Summer is a novel by Robert A. Heinlein. Door into Summer may also refer to:

Door into Summer (album), a 1989 album by Jacob's Trouble
"A Door into Summer", a song by Joe Satriani from the 2013 album Unstoppable Momentum
"The Door into Summer", a song by the Monkees from the 1967 album Pisces, Aquarius, Capricorn & Jones Ltd.
"The Door into Summer", a song by Tatsuro Yamashita from the 1980 album Ride on Time
"Door into Summer", a song in the 1995 platformer Knuckles Chaotix, which was also remixed for Sonic Generations. Natsu e no Tobira, a manga by Keiko Takemiya released in English as The Door into Summer
The Door Into Summer, a 2021 film by Takahiro Miki