How to Remove the Legend Title in Ggplot2

remove legend title in ggplot

You were almost there : just add theme(legend.title=element_blank())

ggplot(df, aes(x, y, colour=g)) +
  geom_line(stat="identity") + 
  theme(legend.position="bottom") +
  theme(legend.title=element_blank())

This page on Cookbook for R gives plenty of details on how to customize legends.

How to change legend title in ggplot

This should work:

p <- ggplot(df, aes(x=rating, fill=cond)) + 
           geom_density(alpha=.3) + 
           xlab("NEW RATING TITLE") + 
           ylab("NEW DENSITY TITLE")
p <- p + guides(fill=guide_legend(title="New Legend Title"))

(or alternatively)

p + scale_fill_discrete(name = "New Legend Title")

How do I remove superfluous legend (titles) in ggplot?

Add scale_linetype(guide = FALSE):

ggplot(df, aes(time, value, group=1)) + 
  geom_line(aes(colour = series, linetype=series)) +
  labs(x= "Locations", y="APC", colour= "New legend title") +
  scale_x_reverse(breaks = c(100, 75, 55, 35, 10, -20),
                           labels = serlabel, expand=c(0,0))+
  scale_linetype(guide = FALSE) +
  theme_bw()

How can I remove the legend title in ggplot2?

You can modify the legend title by passing it as the first parameter to a scale. For example:

ggplot(carrots, aes(y=MeanLength, x=Farm, fill=Type)) + 
  geom_bar(position="dodge") +
  theme(legend.position="top", legend.direction="horizontal") +
  scale_fill_discrete("")

There is also a shortcut for this, i.e. labs(fill="")

Since your legend is at the top of the chart, you may also wish to modify the legend orientation. You can do this using opts(legend.direction="horizontal").

Removing legend name

Here's an example of how to alter the legend title and labels. To remove the title completely, you can set name = NULL.

# Create data frame
df <- read.table(text = "X       Y      Variable
0.351   4.453  a
0.352   4.423  a
0.353   4.422  a
0.351   5.656  b
0.352   5.431  b
0.353   5.222  b", header = TRUE)

# Load libraries
library(ggplot2)

# Plot results
ggplot(data=df, aes(x=df$X, y=df$Y, color=df$Variable))+
  geom_line(size=1)+
  labs(x = "x",
       y = "y") +
  scale_color_manual(values=c("green","red"),
                     breaks=c("a","b"),
                     labels = c("Label one", "Label two"),
                     name = "My Legend Title") +
  theme_bw()

^{Created on 2019-04-25 by the reprex package (v0.2.1)}

Legend title in ggplot2

You can rename aesthetics in legends for example via the ggplot2 function labs like in the following reprex.

library(ggplot2)

df <- data.frame(
  x = runif(100),
  y = runif(100),
  z1 = rnorm(100),
  z2 = abs(rnorm(100))
)

ggplot(df, aes(x, y)) +
  geom_point(aes(colour = z1)) +
  scale_colour_gradient2() +
  labs(colour = "My Legend Name")

reprex output

^{Created on 2021-10-13 by the reprex package (v2.0.1)}

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