只需在library()调用中使用suppressMessages()：

edd@max:~$ R

R version 2.14.1 (2011-12-22)
Copyright (C) 2011 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: x86_64-pc-linux-gnu (64-bit)
[...]

R> suppressMessages(library(ROCR))
R>                                               # silently loaded
R> search() 
 [1] ".GlobalEnv"         "package:ROCR"         # it's really there      
 [3] "package:gplots"     "package:KernSmooth"
 [5] "package:grid"       "package:caTools"   
 [7] "package:bitops"     "package:gdata"     
 [9] "package:gtools"     "package:stats"     
[11] "package:graphics"   "package:grDevices" 
[13] "package:utils"      "package:datasets"  
[15] "package:methods"    "Autoloads"         
[17] "package:base"      
R>

使用suppressPackageStartupMessages，请参阅 MehradMahmoudian 的答案。为完整起见，在此添加用法示例：
对于一个库，请使用suppressPackageStartupMessages(...)，例如：

suppressPackageStartupMessages(library(ggplot2))

对于多个库，请使用suppressPackageStartupMessages({...})，例如：

suppressPackageStartupMessages({
    library(ggplot2)
    library(ggdendro)
})

另见：

Suppress package startup messages

Dirk's answer抑制所有消息，并且不特定于加载包时生成的消息。
对所问问题的更准确的解决方案是：

suppressPackageStartupMessages(library("THE_PACKAGE_NAME"))

可以在here中找到更详细的说明

library(ROCR, quietly = TRUE)可能是更优雅的选项。

如果您使用for循环加载包，那么您必须像下面显示的那样使整个循环静默，而不是在单独加载库时抑制消息。

requiredPackages = c('plyr','dplyr','data.table')
suppressMessages(
 for (p in requiredPackages) {
  if (!require(p, character.only = TRUE)){
   install.packages(p)
  }
  library(p, character.only = TRUE)
 }
)

通过添加quietly = T（如下所示）将解决此问题：

suppressWarnings(suppressMessages(library("dplyr", quietly = T)))

如果有多个 Package ，您可以用途：

## specify the package names
PKGs <- c("affy","gcrma","readxl","ggplot2","lattice" )

它们使用lapply，如下所示：

lapply(PKGs, library, character.only = TRUE ,quietly = T)