Methods, systems, and media for streaming video content using adaptive buffers are provided. In some embodiments, the method comprises: transmitting, from a user device to a server, a request to stream a video content item; receiving, at the user device from the server, a predicted abandonment distribution that indicates a plurality of likelihoods of a user of the user device stopping presentation of the video content item at a corresponding plurality of presentation time points of the video content item; receiving, at the user device from the server, a first portion of the video content item; storing the first portion of the video content item in a buffer of the user device having a first size; causing the video content item to be presented by the user device; determining a second size of the buffer based on the predicted abandonment distribution; modifying a size of the buffer to the second size; requesting a second portion of the video content item from the server based on the second size of the buffer; receiving the second portion of the video content item from the server; and storing the second portion of the video content item in the buffer of the second size while continuing presentation of the video content item.