Blue lettuce

Blue lettuce, wild blue lettuce, or common blue lettuce can refer to:


 * Cicerbita alpina (synonym Lactuca alpina), tall blue lettuce or alpine sow-thistle, native to upland and mountainous parts of Europe
 * Lactuca biennis, tall blue lettuce or blue wood lettuce, native to the eastern half of the United States and Canada
 * Lactuca canadensis, Florida blue lettuce or Canada blue lettuce, considered to be a native to parts of North America and introduced elsewhere
 * Lactuca perennis, blue lettuce, native to Central and Southern Europe
 * Lactuca pulchella, blue lettuce, native to North America
 * Lactuca tatarica, blue lettuce, native to Europe and Asia