You want to load data from an SPSS file.

The foreign package has the function read.spss() for reading SPSS files. To load data from the first sheet of an SPSS file:

# Only need to install the first time
install.packages("foreign")

library(foreign)
data <- read.spss("datafile.sav")

The foreign package also includes functions to load from other formats, including:

See ls("package:foreign") for a full list of functions in the package.