It is generally agreed upon among all versions of Batman that he is "The World's Greatest Detective." That being said, he has shown skill in certain areas across all versions:
- Forensic Science
- Criminal Psychology
- Fingerprint Analysis
- Criminal Profiling
- Chemistry
- Human Anatomy
- Information Technology
- Communication Technology
- Forensic Pathology
He is also shown to be fluent in an indeterminate number of languages including French, Spanish, Russian, Japanese, and Chinese.
As far as his martial arts training, sometimes he is said to be a "Master" of all known martial arts, and other times just to have studied the "Major" ones and combined several into his own style. He has demonstrated knowledge of:
- Shao-Lin Wushu
- Judo
- Aikido
- Capoera
- Savate
- Jujitsu
- Ninjutsu
- Karate
- Krav Maga
- Muay Tai
- Eskrima
- Sambo
- Traditional Boxing
He is also shown to be highly skilled in the areas of:
- Manhunting
- Escapology
- Misdirection
- Sleight of Hand
- Psychological Intimidation
- First Aid (Combat Medic)
- Interrogation
In some versions he is shown to also have skill as a mechanic and engineer, at other times these duties are handled by either Alfred or Harold Alnut.
While not necessarily fields of knowledge in the traditional sense, he has also shown great skill in Lateral Thinking and Deductive Reasoning.