Writer's block is a non-medical condition, primarily associated with writing, in which an author is either unable to produce new work or experiences a creative slowdown.

Writer's block has various degrees of severity, from difficulty in coming up with original ideas to being unable to produce work for years. This condition is not solely measured by time passing without writing, it is measured by time passing without productivity in the task at hand. Writer's block has been an acknowledged problem throughout recorded history.

However, not until 1947 was the term writer's block coined by the Austrian psychiatrist Edmund Bergler. All types of writers, including full-time professionals, academics, workers of creative projects, and those trying to finish written assignments, can experience writer's block. The condition has many causes, some that are even unrelated to writing. The majority of writer's block researchers agree that most causes of writer's block have an affective/physiological, motivational, and cognitive component.

Studies have found effective coping strategies to deal with writer's block. These strategies to remove the anxiety about writing range from ideas such as free writing and brainstorming to talking to a professional.