Notes from the Underground is a fictional collection of memoirs written by a civil servant living alone in St. Petersburg. The man is never named and is generally referred to as the Underground Man. The "underground" in the book refers to the narrator's isolation, which he described in chapter 11 as "listening through a crack under the floor".

It is considered to be one of the first existentialist novels. With this book, Dostoevsky challenged the ideologies of his time, like nihilism and utopianism. The Underground Man shows how idealized rationality in utopias is inherently flawed, because it doesn't account for the irrational side of humanity.

This novel has had a big impact on many different works of literature and philosophy. It has influenced writers like Franz Kafka and Friedrich Nietzsche. A similar character is also found in Martin Scorsese's Taxi Driver.

Notes from the Underground was published in 1864 as the first four issues of Epoch, a Russian magazine by Fyodor and Mikhail Dostoevsky.