diff --git a/stdlib/REPL/docs/src/index.md b/stdlib/REPL/docs/src/index.md
index 4e7dfca112b06..9d61b67740542 100644
--- a/stdlib/REPL/docs/src/index.md
+++ b/stdlib/REPL/docs/src/index.md
@@ -211,8 +211,10 @@ Just as `^R` is a reverse search, `^S` is a forward search, with the prompt ```(
  The two may be used in conjunction with each other to move through the previous or next matching
 results, respectively.
 
-All executed commands in the Julia REPL are logged into `~/.julia/logs/repl_history.jl` along with a timestamp of when it was executed
-and the current REPL mode you were in. Search mode queries this log file in order to find the commands which you previously ran.
+All executed commands in the Julia REPL are logged into `~/.julia/logs/repl_history.jl` along with a timestamp of when it was executed,
+a session id,
+and the current REPL mode you were in. The session id is set at the start of execution of the REPL.
+Search mode queries this log file in order to find the commands which you previously ran.
 This can be disabled at startup by passing the `--history-file=no` flag to Julia.
 
 ## Key bindings
diff --git a/stdlib/REPL/src/REPL.jl b/stdlib/REPL/src/REPL.jl
index 8e15bed447682..18ced3e7ede5a 100644
--- a/stdlib/REPL/src/REPL.jl
+++ b/stdlib/REPL/src/REPL.jl
@@ -29,7 +29,9 @@ import Base:
     display,
     show,
     AnyDict,
-    ==
+    ==,
+    UUID,
+    rand
 
 _displaysize(io::IO) = displaysize(io)::Tuple{Int,Int}
 
@@ -534,10 +536,11 @@ mutable struct REPLHistoryProvider <: HistoryProvider
     last_mode::Union{Nothing,Prompt}
     mode_mapping::Dict{Symbol,Prompt}
     modes::Vector{Symbol}
+    session::UUID
 end
 REPLHistoryProvider(mode_mapping::Dict{Symbol}) =
     REPLHistoryProvider(String[], nothing, 0, 0, -1, IOBuffer(),
-                        nothing, mode_mapping, UInt8[])
+                        nothing, mode_mapping, UInt8[], UUID(rand(UInt128)))
 
 invalid_history_message(path::String) = """
 Invalid history file ($path) format:
@@ -614,6 +617,7 @@ function add_history(hist::REPLHistoryProvider, s::PromptState)
     entry = """
     # time: $(Libc.strftime("%Y-%m-%d %H:%M:%S %Z", time()))
     # mode: $mode
+    # session: $(hist.session)
     $(replace(str, r"^"ms => "\t"))
     """
     # TODO: write-lock history file