diff --git a/src/garageS3.jl b/src/garageS3.jl
index 9399977..ca264b6 100644
--- a/src/garageS3.jl
+++ b/src/garageS3.jl
@@ -1,6 +1,7 @@
 module garageS3
 
 export
+    LifecycleExpiration, build_lifecycle_xml,
     GarageStorage, put_file, get_file, list_files, delete_file,
     set_lifecycle_expiration, get_lifecycle, delete_lifecycle
 
@@ -266,11 +267,110 @@ function delete_file(storage::GarageStorage, key::String)
 end
 
 
+# ===================================================================
+# 3. Bucket Lifecycle Configuration
+# ===================================================================
 
+""" Lifecycle expiration configuration for a bucket.
 
+# Fields
+- `prefix::String`: Object key prefix this rule applies to.
+- `days::Int`: Number of days after object creation to expire/delete.
+- `enabled::Bool`: Whether the rule is active (default: `true`).
+- `id::String`: Unique identifier for the rule (default: auto-generated).
+"""
+struct LifecycleExpiration
+    prefix::String
+    days::Int
+    enabled::Bool
+    id::String
+end
+function LifecycleExpiration(prefix::String, days::Int; enabled::Bool=true, id::String="")
+    rule_id = isempty(id) ? "expire-" * replace(prefix, "/" => "_") * "-" * string(days) * "d" : id
+    return LifecycleExpiration(prefix, days, enabled, rule_id)
+end
 
+""" Build the XML body for a PutBucketLifecycleConfiguration request.
 
+Supports a single rule with expiration by prefix.
+"""
+function build_lifecycle_xml(rule::LifecycleExpiration)::String
+    status = rule.enabled ? "Enabled" : "Disabled"
+    return """<?xml version="1.0" encoding="UTF-8"?>
+<LifecycleConfiguration>
+  <Rule>
+    <ID>$(rule.id)</ID>
+    <Filter>
+      <Prefix>$(rule.prefix)</Prefix>
+    </Filter>
+    <Status>$status</Status>
+    <Expiration>
+      <Days>$(rule.days)</Days>
+    </Expiration>
+  </Rule>
+</LifecycleConfiguration>"""
+end
 
+""" Set bucket lifecycle expiration rule.
 
+# Arguments
+- `storage::GarageStorage`: The storage client instance.
+- `rule::LifecycleExpiration`: The lifecycle expiration rule.
+
+# Returns
+- `Dict{String, Any}`: Parsed response from the server.
+
+# Example
+```julia
+rule = LifecycleExpiration("uploads/", 30)
+set_lifecycle_expiration(storage, rule)
+```
+"""
+function set_lifecycle_expiration(storage::GarageStorage, rule::LifecycleExpiration)
+    xml_body = build_lifecycle_xml(rule)
+    args = Dict{String,Any}("body" => xml_body)
+    return S3.put_bucket_lifecycle_configuration(storage.bucket, args; aws_config=storage.config)
+end
+
+""" Get the bucket lifecycle configuration.
+
+# Arguments
+- `storage::GarageStorage`: The storage client instance.
+
+# Returns
+- `Dict{String, Any}`: Parsed lifecycle configuration, or `nothing` if no lifecycle is configured.
+
+# Example
+```julia
+config = get_lifecycle(storage)
+```
+"""
+function get_lifecycle(storage::GarageStorage)::Union{Dict{String,Any},Nothing}
+    try
+        return S3.get_bucket_lifecycle_configuration(storage.bucket; aws_config=storage.config)
+    catch e
+        if isa(e, AWS.AWSException) && e.code == "NoSuchLifecycleConfiguration"
+            return nothing
+        end
+        rethrow(e)
+    end
+end
+
+""" Delete the bucket lifecycle configuration.
+
+# Arguments
+- `storage::GarageStorage`: The storage client instance.
+
+# Returns
+- `Dict{String, Any}`: Parsed response from the server.
+
+# Example
+```julia
+delete_lifecycle(storage)
+```
+"""
+function delete_lifecycle(storage::GarageStorage)
+    return S3.delete_bucket_lifecycle(storage.bucket; aws_config=storage.config)
+end
 
 end # module GarageS3
diff --git a/test/runtests.jl b/test/runtests.jl
index ea29e64..8ef2cf7 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -343,4 +343,121 @@ using UUIDs: uuid4
         delete_file(storage, test_key)
     end
 
+    # --- Lifecycle configuration tests ---
+
+    @testset "LifecycleExpiration construction with default ID" begin
+        rule = LifecycleExpiration("uploads/", 30)
+        @test rule.prefix == "uploads/"
+        @test rule.days == 30
+        @test rule.enabled == true
+        @test rule.id == "expire-uploads_-30d"
+    end
+
+    @testset "LifecycleExpiration construction with custom ID" begin
+        rule = LifecycleExpiration("data/", 7; id="my-rule")
+        @test rule.prefix == "data/"
+        @test rule.days == 7
+        @test rule.enabled == true
+        @test rule.id == "my-rule"
+    end
+
+    @testset "LifecycleExpiration with disabled flag" begin
+        rule = LifecycleExpiration("temp/", 1; enabled=false)
+        @test rule.enabled == false
+    end
+
+    @testset "LifecycleExpiration with nested prefix" begin
+        rule = LifecycleExpiration("deep/nested/", 90)
+        @test rule.prefix == "deep/nested/"
+    end
+
+    @testset "build_lifecycle_xml generates valid XML" begin
+        rule = LifecycleExpiration("test/", 14; id="test-rule")
+        xml = build_lifecycle_xml(rule)
+        @test occursin("<?xml version=\"1.0\"", xml)
+        @test occursin("<LifecycleConfiguration>", xml)
+        @test occursin("<ID>test-rule</ID>", xml)
+        @test occursin("<Prefix>test/</Prefix>", xml)
+        @test occursin("<Status>Enabled</Status>", xml)
+        @test occursin("<Days>14</Days>", xml)
+        @test occursin("</LifecycleConfiguration>", xml)
+    end
+
+    @testset "build_lifecycle_xml generates disabled rule XML" begin
+        rule = LifecycleExpiration("temp/", 1; enabled=false)
+        xml = build_lifecycle_xml(rule)
+        @test occursin("<Status>Disabled</Status>", xml)
+    end
+
+    @testset "integration: lifecycle CRUD - set and get" begin
+        storage = GarageStorage(
+            "https://s3-api.yiem.cc",
+            "GKb080154a2e5b19100b1b2c6e",
+            "a2c6b1379c2f731d3e6e5a408dd4d6cffca7511717675f55114ff94828febca1",
+            "testbucket"
+        )
+
+        # Should return nothing when no lifecycle is set
+        lc = get_lifecycle(storage)
+        @test lc === nothing
+
+        # Set lifecycle
+        rule = LifecycleExpiration("lifecycle-test/", 45)
+        set_lifecycle_expiration(storage, rule)
+
+        # Should return configuration after setting
+        lc = get_lifecycle(storage)
+        @test lc !== nothing
+        @test haskey(lc, "Rule")
+
+        # Delete lifecycle
+        delete_lifecycle(storage)
+
+        # Should return nothing after deletion
+        lc = get_lifecycle(storage)
+        @test lc === nothing
+    end
+
+    @testset "integration: lifecycle with nested prefix" begin
+        storage = GarageStorage(
+            "https://s3-api.yiem.cc",
+            "GKb080154a2e5b19100b1b2c6e",
+            "a2c6b1379c2f731d3e6e5a408dd4d6cffca7511717675f55114ff94828febca1",
+            "testbucket"
+        )
+
+        rule = LifecycleExpiration("a/b/c/", 20; id="nested-rule")
+        set_lifecycle_expiration(storage, rule)
+
+        lc = get_lifecycle(storage)
+        @test lc !== nothing
+        @test haskey(lc, "Rule")
+
+        delete_lifecycle(storage)
+        @test get_lifecycle(storage) === nothing
+    end
+
+    @testset "integration: lifecycle enabled/disabled toggle" begin
+        storage = GarageStorage(
+            "https://s3-api.yiem.cc",
+            "GKb080154a2e5b19100b1b2c6e",
+            "a2c6b1379c2f731d3e6e5a408dd4d6cffca7511717675f55114ff94828febca1",
+            "testbucket"
+        )
+
+        # Set enabled rule
+        rule1 = LifecycleExpiration("toggle/", 10; enabled=true)
+        set_lifecycle_expiration(storage, rule1)
+        lc = get_lifecycle(storage)
+        @test lc !== nothing
+
+        # Override with disabled rule
+        rule2 = LifecycleExpiration("toggle/", 10; enabled=false)
+        set_lifecycle_expiration(storage, rule2)
+        lc = get_lifecycle(storage)
+        @test lc !== nothing
+
+        delete_lifecycle(storage)
+    end
+
 end