Dreaming of a diary symbolizes the need for self-reflection and introspection. It signifies a desire to examine your thoughts, emotions, and experiences in a more organized and structured manner. This dream may indicate the importance of keeping track of your life's events or the need to document your feelings and ideas. It suggests a potential longing for a greater sense of clarity and understanding in your waking life. Alternatively, dreaming of a diary may suggest a need for privacy and a desire to keep certain aspects of your life hidden or protected from others. Consider the context and emotions within the dream for a more accurate interpretation.