结兰胶（英语：Gellan gum），一种水溶性的高分子多糖胶状物，由一种假单胞杆菌属的细菌，Pseudomonas elodea，产生。经常被当作食品添加物，可使食品变浓稠、稳定。常添加在优酪乳中。

Gellan gum is a water-soluble anionic polysaccharide produced by the bacterium Sphingomonas elodea (formerly Pseudomonas elodea). The gellan-producing bacterium was discovered and isolated by the former Kelco Division of Merck & Company, Inc. in 1978 from the lily plant tissue from a natural pond in Pennsylvania, USA. It was initially identified as a substitute gelling agent at significantly lower use level to replace agar in solid culture media for the growth of various microorganisms Its initial commercial product with the trademark as "GELRITE" gellan gum, was subsequently identified as a suitable agar substitute as gelling agent in various clinical bacteriological media.