歌川国贞（うたがわ くにさだ，1786年－1865年），日本江户时期浮世绘画家，又称三代歌川豊国。

师承歌川丰国（丰国初代），以画色情画闻名，画中女人多颓废好色、忧郁疲惫。他的「原柳桥.雪的景象」广为人知。画风自成一格，号称歌川派，是日本浮世绘派别影响力最大的一派。最出名的画号为：

Utagawa Kunisada (Japanese:歌川 国貞; also known as Utagawa Toyokuni III (三代歌川豊国); 1786 – 12 January 1865) was the most popular, prolific and financially successful designer of ukiyo-e woodblock prints in 19th-century Japan. In his own time, his reputation far exceeded that of his contemporaries, Hokusai, Hiroshige and Kuniyoshi.