diff --git a/migrate2rocky/README.md b/migrate2rocky/README.md
index bf1439d..0db6fcf 100644
--- a/migrate2rocky/README.md
+++ b/migrate2rocky/README.md
@@ -13,6 +13,13 @@ Running this script will convert an existing CentOS 8 system to Rocky Linux 8.
 
 [!! USE WITH CAUTION !!]
 ```
+#### Use Mirror URLs of Rocky Linux
+
+```bash
+export ROCKY_REPO_MIRROR_URL="https://mirrors.example.org/rocky"
+
+./migrate2rocky.sh -r
+```
 
 ### Disk Space Requirements
 
diff --git a/migrate2rocky/migrate2rocky.sh b/migrate2rocky/migrate2rocky.sh
index b34633c..888f883 100644
--- a/migrate2rocky/migrate2rocky.sh
+++ b/migrate2rocky/migrate2rocky.sh
@@ -138,7 +138,11 @@ SUPPORTED_MAJOR="8"
 SUPPORTED_PLATFORM="platform:el$SUPPORTED_MAJOR"
 ARCH=$(arch)
 
-gpg_key_url="https://dl.rockylinux.org/pub/rocky/RPM-GPG-KEY-rockyofficial"
+# Use Mirror URLs of Rocky Linux from environment if set.
+ROCKY_REPO_DEFAULT_URL="https://dl.rockylinux.org/pub/rocky"
+ROCKY_REPO_URL="${ROCKY_REPO_MIRROR_URL:-"${ROCKY_REPO_DEFAULT_URL}"}"
+
+gpg_key_url="${ROCKY_REPO_URL}/RPM-GPG-KEY-rockyofficial"
 gpg_key_sha512="88fe66cf0a68648c2371120d56eb509835266d9efdf7c8b9ac8fc101bdf1f0e0197030d3ea65f4b5be89dc9d1ef08581adb068815c88d7b1dc40aa1c32990f6a"
 
 sm_ca_dir=/etc/rhsm/ca
@@ -147,8 +151,8 @@ unset tmp_sm_ca_dir
 # all repos must be signed with the same key given in $gpg_key_url
 declare -A repo_urls
 repo_urls=(
-    [rockybaseos]="https://dl.rockylinux.org/pub/rocky/${SUPPORTED_MAJOR}/BaseOS/$ARCH/os/"
-    [rockyappstream]="https://dl.rockylinux.org/pub/rocky/${SUPPORTED_MAJOR}/AppStream/$ARCH/os/"
+    [rockybaseos]="${ROCKY_REPO_URL}/${SUPPORTED_MAJOR}/BaseOS/$ARCH/os/"
+    [rockyappstream]="${ROCKY_REPO_URL}/${SUPPORTED_MAJOR}/AppStream/$ARCH/os/"
 )
 
 # These are additional packages that should always be installed.
@@ -1073,6 +1077,16 @@ EOF
         done
     fi
 
+    # Replace mirror
+    if [[ $ROCKY_REPO_MIRROR_URL ]]; then 
+        local -a repo_files
+        readarray -t repo_files < <(rpm -ql rocky-repos | grep '\.repo$')
+        sed -e 's|^mirrorlist=|#mirrorlist=|g' \
+            -e "s|^#baseurl=http://dl.rockylinux.org/\$contentdir|baseurl=${ROCKY_REPO_URL}|g" \
+            -i.migrate2rocky \
+            "${repo_files[@]}"
+    fi
+
     # Distrosync
     infomsg $'Ensuring repos are enabled before the package swap\n'
     safednf -y --enableplugin=config_manager config-manager \