diff --git a/stdlib/LinearAlgebra/src/tridiag.jl b/stdlib/LinearAlgebra/src/tridiag.jl
index c14ed5690198c..0ba03634d82ad 100644
--- a/stdlib/LinearAlgebra/src/tridiag.jl
+++ b/stdlib/LinearAlgebra/src/tridiag.jl
@@ -1045,3 +1045,21 @@ function _copyto_banded!(A::SymTridiagonal, B::Tridiagonal)
     _evview(A) .= B.du
     return A
 end
+
+# display
+function show(io::IO, T::Tridiagonal)
+    print(io, "Tridiagonal(")
+    show(io, T.dl)
+    print(io, ", ")
+    show(io, T.d)
+    print(io, ", ")
+    show(io, T.du)
+    print(io, ")")
+end
+function show(io::IO, S::SymTridiagonal)
+    print(io, "SymTridiagonal(")
+    show(io, eltype(S) <: Number ? S.dv : view(S, diagind(S, IndexStyle(S))))
+    print(io, ", ")
+    show(io, S.ev)
+    print(io, ")")
+end
diff --git a/stdlib/LinearAlgebra/test/tridiag.jl b/stdlib/LinearAlgebra/test/tridiag.jl
index 41a28631b27a0..e0a8e32d77852 100644
--- a/stdlib/LinearAlgebra/test/tridiag.jl
+++ b/stdlib/LinearAlgebra/test/tridiag.jl
@@ -18,6 +18,9 @@ using .Main.FillArrays
 isdefined(Main, :OffsetArrays) || @eval Main include(joinpath($(BASE_TEST_PATH), "testhelpers", "OffsetArrays.jl"))
 using .Main.OffsetArrays
 
+isdefined(Main, :SizedArrays) || @eval Main include(joinpath($(BASE_TEST_PATH), "testhelpers", "SizedArrays.jl"))
+using .Main.SizedArrays
+
 include("testutils.jl") # test_approx_eq_modphase
 
 #Test equivalence of eigenvectors/singular vectors taking into account possible phase (sign) differences
@@ -914,4 +917,17 @@ end
     end
 end
 
+@testset "show" begin
+    T = Tridiagonal(1:3, 1:4, 1:3)
+    @test sprint(show, T) == "Tridiagonal(1:3, 1:4, 1:3)"
+    S = SymTridiagonal(1:4, 1:3)
+    @test sprint(show, S) == "SymTridiagonal(1:4, 1:3)"
+
+    m = SizedArrays.SizedArray{(2,2)}(reshape([1:4;],2,2))
+    T = Tridiagonal(fill(m,2), fill(m,3), fill(m,2))
+    @test sprint(show, T) == "Tridiagonal($(repr(diag(T,-1))), $(repr(diag(T))), $(repr(diag(T,1))))"
+    S = SymTridiagonal(fill(m,3), fill(m,2))
+    @test sprint(show, S) == "SymTridiagonal($(repr(diag(S))), $(repr(diag(S,1))))"
+end
+
 end # module TestTridiagonal