For blotter acid, see LSD

Blotter can also refer to an official summary, usually covering a short duration, such as a police blotter, or the trade confirmation summary of a financial institution. The term is frequently used in financial institution software terms to represent a list of current trades in a spreadsheet-like interface whose status is updated in real-time. The trades are often highlighted in different colours depending on their status.

For a desk blotter, see desk

For an antique blotter associated with a quill pen, see fountain pen and blotting paper.

Blotter, an American TV show, parodying the long running TV show, COPS, similarly to Reno 911!.