Flask may refer to: Container Hip flask, a small container used to carry a small amount of liquid Laboratory flask, laboratory glassware for holding larger volumes than simple test tubes Erlenmeyer flask, a common laboratory flask with a flat bottom, a conical body, and a cylindrical neck Vacuum flask, a container designed to keep warm drinks warm and refrigerated drinks cold Other Flask (metal casting), a containing frame without a top or bottom, with sides only, used to hold molding sand Flask (web framework), a web framework for the Python programming language Powder flask, a small container for gunpowder FLASK, the Flux Advanced Security Kernel, an operating system security architecture Flask (unit), a unit used in UK avoirdupois weight to measure the element mercury The Flask, Hampstead, a Grade II listed public house at 14 Flask Walk, Hampstead, London The Flask, Highgate, a Grade II listed public house at 74–76 Highgate West Hill, Highgate, London See also Lagena (disambiguation), a word derived from the Greek meaning flask