It's one of the most googled questions in the R community: "How do I remove the legend title in ggplot2?"

The Solution

Add this to your plot:

+ theme(legend.title = element_blank())

Example

ggplot(df, aes(x=Group, y=Value, fill=Group)) +
geom_boxplot() +
theme(legend.title = element_blank())

If you want to change the title instead of removing it, use the labs() function:

+ labs(fill = "New Title")

Note: If you mapped to color instead of fill, use labs(color = "New Title").

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Tags:#ggplot2#R#legend#tutorial