Fritillaria gentneri, or Gentner's fritillary, is a rare species of flowering plant in the lily family Liliaceae, that is endemic to southwest Oregon and adjacent Siskiyou County, California, USA.

Dr. Helen M. Gilkey, curator of the herbarium at the Oregon State College, published it as a new species with Gentner as its namesake.

In her 1951 paper in Madroño in she distinguished it from the similar Fritillaria recurva: "As brilliant in color as F. recurva, the blossom of this new form is consistently of a different shade of red; its flowering period begins two weeks later; the plant is typically more robust..."[2] Gentner's fritillary grows 50–70 cm (20–28 in) tall, bears nodding reddish flowers checkered with yellow, tepals with reflexed tips, and glaucous stems with whorls of leaves.

It can be distinguished from Fritillaria recurva by its spreading style, longer, more conspicuous glands, and the generally unrecurved tips of its tepals.

The city of Jacksonville has set aside over 300 acres (1.2 km2) of habitat for Gentner's fritillary and hosts a festival dedicated to the flower every April.