桑托期（Santonian）是晚白垩纪的第四个时期，时间为 85.8 ± 0.7 百万年前至 83.5 ± 0.7 百万年前，在科尼亚克期之后。

The Santonian is an age in the geologic timescale or a chronostratigraphic stage. It is a subdivision of the Late Cretaceous epoch or Upper Cretaceous series. It spans the time between 86.3 ± 0.7 mya (million years ago) and 83.6 ± 0.7 mya. The Santonian is preceded by the Coniacian and is followed by the Campanian.