假交替单胞菌属（Pseudoalteromonas）是一类海洋细菌。该属细菌在深海沉积物中广泛存在，且多数具有较强的胞外蛋白酶活性。在实验室培养该属细菌时，菌落生长较快，一般是乳白色菌落。

Pseudoalteromonas is a genus of marine bacterium. In 1995, Gauthier et al proposed Pseudoalteromonas as a new genus to be split from Alteromonas. The Pseudoalteromonas species that were described before 1995 were originally part of the Alteromonas genus, and were reassigned to Pseudoalteromonas based on the rRNA-DNA analysis done by Gauthier et al.