"No Reply" is a song by the Beatles from the UK album Beatles for Sale and the US album Beatles '65. It was written mainly by John Lennon and credited to Lennon/McCartney.
The song is about a young man who is unable to contact his possibly unfaithful girlfriend, even though he sees her through her windows.
According to Lennon in 1972, the Beatles' music publisher Dick James was quite pleased with "No Reply":
This happened once before
When I came to your door, no reply
They said it wasn't you
But I saw you peep through your window