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The B-box proteins (BBXs) are a class of zinc finger transcription factors containing one or two B-BOX domains that play important roles in plant growth, development and stress response. The petunia (
Petunia hybrida
) is a model ornamental plant, and its draft genome has been published. However, no systematic study of the
BBX
gene family in
Petunia
has been reported. In this study, a total of 28 BBX members from the
Petunia
genome were identified. We performed analyses of their phylogenetic relationships, structures, conserved motifs, promoter regions, and expression patterns. Based on the phylogenetic relationship, the PhBBXs were divided into six groups. Analysis of the gene structures and conserved motifs further confirmed the closer relationships in each group. Based on the RNA-seq data, the transcript abundance of
PhBBXs
in different tissues were divided into two major groups. The analysis of
cis
-elements showed that many stress responsive elements appeared in the promoter region of most
PhBBX
genes. The stress response patterns of
PhBBXs
were detected under drought, salinity, cold and heat treatments. Based on the RNA-seq data, we found that 3 genes responded to drought, 8 genes responded to salt, 18 genes responded to cold, and 15 genes responded to heat. In conclusion, this study may facilitate further functional studies of BBXs in
Petunia
.