The following outline is provided as an overview of and topical guide to thought (thinking):

Thought is the object of a mental process called thinking, in which beings form psychological associations and models of the world. Thinking is manipulating information, as when we form concepts, engage in problem solving, reason and make decisions. Thought, the act of thinking, produces more thoughts. A thought may be an idea, an image, a sound or even control an emotional feeling.

Thought (or thinking) can be described as all of the following:

2. Propositions and Beliefs

3. Reasoning and Argumentation

4. Inquiry and Speculation

5. Explanation and Synthesis

6. Definition