长颈漏斗是漏斗的一种(又称蓟头漏斗)，主要用于固体和液体在锥形瓶中反应时添加液体药品。一般还可以用分液漏斗替代。与分液漏斗相比，长颈漏斗的可控性不佳。而且在使用时，注意液封（即漏斗的底部要在液面以下），防止生成的气体从长颈漏斗逸出。

A thistle tube is a piece of laboratory glassware consisting of a shaft of tube, with a reservoir and funnel-like section at the top. Thistle tubes are typically used by chemists to add liquid to an existing system or apparatus. Thistle funnels are used to add small volumes of liquids to an exact position. Thistle funnels are found with taps or without taps.