IANAL is a Usenet and chat abbreviation (initialism) for the expansion "I am not a lawyer". The expansion may be used by non-lawyers who are seeking to avoid accusations of unauthorized practice of law and are not making any recommendation to the particular addressee of their remarks.

A related abbreviation, TINLA, stands for "This is not legal advice". One or both of these expansions often precede opinions about law. The use of these expansions serves as a warning for the reader not to take the opinion as professional legal advice. Many jurisdictions have legal restrictions on actually giving or even appearing to give legal advice, or otherwise practicing as a lawyer without legal qualifications and official registration. Rendition of legal advice by a person who is not licensed to do so can be the basis for a charge of unauthorized practice of law.