diff --git a/base/tuple.jl b/base/tuple.jl
index ee3174d783531..38357b3404b08 100644
--- a/base/tuple.jl
+++ b/base/tuple.jl
@@ -645,6 +645,11 @@ revargs(x, r...) = (revargs(r...)..., x)
 
 reverse(t::Tuple) = revargs(t...)
 
+function isassigned(v::Tuple, i::Integer)
+    @boundscheck 1 <= i <= length(v) || return false
+    true
+end
+
 ## specialized reduction ##
 
 prod(x::Tuple{}) = 1
diff --git a/test/tuple.jl b/test/tuple.jl
index 13af5ac992434..c55605becb730 100644
--- a/test/tuple.jl
+++ b/test/tuple.jl
@@ -850,3 +850,11 @@ end
         end
     end
 end
+
+@testset "isassigned" begin
+    t = (1, 2, 3)
+    @test isassigned(t, 0) === false
+    @test isassigned(t, 1) === true
+    @test isassigned(t, 3) === true
+    @test isassigned(t, 4) === false
+end