鹅蛋形，又简单称作蛋形，是一种近似椭圆形的形像，其外貌就像是一个拉长了的圆形，但又没有鸡蛋那种一边较尖但另一边较圆的外貌。

「鹅蛋形」这个描述其实在三维立体方面的描述比较多，用以描述一些蛋壳形构造的纵切面形状。由于其曲率跟一般椭圆形或长圆形的曲率有所不同，才会有这种分野。

An oval (from Latin ovum, "egg") is a closed curve in a plane which "loosely" resembles the outline of an egg. The term is not very specific, but in some areas (projective geometry, technical drawing, etc.) it is given a more precise definition, which may include either one or two axes of symmetry. In common English, the term is used in a broader sense: any shape which reminds one of an egg.