diff --git a/Dockerfile b/Dockerfile
index d3f85a5bd641..fe84d015b548 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,10 +6,14 @@
 # This Dockerfile uses JDK17 by default.
 # To build with other versions, use "--build-arg JDK_VERSION=[value]"
 ARG JDK_VERSION=17
+# The Docker version tag to build from
 ARG DSPACE_VERSION=latest
+# The Docker registry to use for DSpace images. Defaults to "docker.io"
+# NOTE: non-DSpace images are hardcoded to use "docker.io" and are not impacted by this build argument
+ARG DOCKER_REGISTRY=docker.io
 
 # Step 1 - Run Maven Build
-FROM dspace/dspace-dependencies:${DSPACE_VERSION} AS build
+FROM ${DOCKER_REGISTRY}/dspace/dspace-dependencies:${DSPACE_VERSION} AS build
 ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 # The dspace-installer directory will be written to /install
@@ -31,15 +35,15 @@ RUN mvn --no-transfer-progress package ${MAVEN_FLAGS} && \
 RUN rm -rf /install/webapps/server/
 
 # Step 2 - Run Ant Deploy
-FROM eclipse-temurin:${JDK_VERSION} AS ant_build
+FROM docker.io/eclipse-temurin:${JDK_VERSION} AS ant_build
 ARG TARGET_DIR=dspace-installer
 # COPY the /install directory from 'build' container to /dspace-src in this container
 COPY --from=build /install /dspace-src
 WORKDIR /dspace-src
 # Create the initial install deployment using ANT
-ENV ANT_VERSION 1.10.13
-ENV ANT_HOME /tmp/ant-$ANT_VERSION
-ENV PATH $ANT_HOME/bin:$PATH
+ENV ANT_VERSION=1.10.13
+ENV ANT_HOME=/tmp/ant-$ANT_VERSION
+ENV PATH=$ANT_HOME/bin:$PATH
 # Need wget to install ant
 RUN apt-get update \
     && apt-get install -y --no-install-recommends wget \
@@ -52,7 +56,7 @@ RUN mkdir $ANT_HOME && \
 RUN ant init_installation update_configs update_code update_webapps
 
 # Step 3 - Start up DSpace via Runnable JAR
-FROM eclipse-temurin:${JDK_VERSION}
+FROM docker.io/eclipse-temurin:${JDK_VERSION}
 # NOTE: DSPACE_INSTALL must align with the "dspace.dir" default configuration.
 ENV DSPACE_INSTALL=/dspace
 # Copy the /dspace directory from 'ant_build' container to /dspace in this container
diff --git a/Dockerfile.cli b/Dockerfile.cli
index 5254d1eb4d69..f13b05fc1308 100644
--- a/Dockerfile.cli
+++ b/Dockerfile.cli
@@ -6,10 +6,14 @@
 # This Dockerfile uses JDK17 by default.
 # To build with other versions, use "--build-arg JDK_VERSION=[value]"
 ARG JDK_VERSION=17
+# The Docker version tag to build from
 ARG DSPACE_VERSION=latest
+# The Docker registry to use for DSpace images. Defaults to "docker.io"
+# NOTE: non-DSpace images are hardcoded to use "docker.io" and are not impacted by this build argument
+ARG DOCKER_REGISTRY=docker.io
 
 # Step 1 - Run Maven Build
-FROM dspace/dspace-dependencies:${DSPACE_VERSION} AS build
+FROM ${DOCKER_REGISTRY}/dspace/dspace-dependencies:${DSPACE_VERSION} AS build
 ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 # The dspace-installer directory will be written to /install
@@ -25,15 +29,15 @@ RUN mvn --no-transfer-progress package && \
   mvn clean
 
 # Step 2 - Run Ant Deploy
-FROM eclipse-temurin:${JDK_VERSION} AS ant_build
+FROM docker.io/eclipse-temurin:${JDK_VERSION} AS ant_build
 ARG TARGET_DIR=dspace-installer
 # COPY the /install directory from 'build' container to /dspace-src in this container
 COPY --from=build /install /dspace-src
 WORKDIR /dspace-src
 # Create the initial install deployment using ANT
-ENV ANT_VERSION 1.10.13
-ENV ANT_HOME /tmp/ant-$ANT_VERSION
-ENV PATH $ANT_HOME/bin:$PATH
+ENV ANT_VERSION=1.10.13
+ENV ANT_HOME=/tmp/ant-$ANT_VERSION
+ENV PATH=$ANT_HOME/bin:$PATH
 # Need wget to install ant
 RUN apt-get update \
     && apt-get install -y --no-install-recommends wget \
@@ -46,7 +50,7 @@ RUN mkdir $ANT_HOME && \
 RUN ant init_installation update_configs update_code
 
 # Step 3 - Run jdk
-FROM eclipse-temurin:${JDK_VERSION}
+FROM docker.io/eclipse-temurin:${JDK_VERSION}
 # NOTE: DSPACE_INSTALL must align with the "dspace.dir" default configuration.
 ENV DSPACE_INSTALL=/dspace
 # Copy the /dspace directory from 'ant_build' container to /dspace in this container
diff --git a/Dockerfile.dependencies b/Dockerfile.dependencies
index f3bf1f833205..34bfbc3b8c78 100644
--- a/Dockerfile.dependencies
+++ b/Dockerfile.dependencies
@@ -7,7 +7,7 @@
 ARG JDK_VERSION=17
 
 # Step 1 - Run Maven Build
-FROM maven:3-eclipse-temurin-${JDK_VERSION} AS build
+FROM docker.io/maven:3-eclipse-temurin-${JDK_VERSION} AS build
 ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 # Create the 'dspace' user account & home directory
diff --git a/Dockerfile.test b/Dockerfile.test
index 218126b17aab..2205c1d5605f 100644
--- a/Dockerfile.test
+++ b/Dockerfile.test
@@ -8,10 +8,14 @@
 # This Dockerfile uses JDK17 by default.
 # To build with other versions, use "--build-arg JDK_VERSION=[value]"
 ARG JDK_VERSION=17
+# The Docker version tag to build from
 ARG DSPACE_VERSION=latest
+# The Docker registry to use for DSpace images. Defaults to "docker.io"
+# NOTE: non-DSpace images are hardcoded to use "docker.io" and are not impacted by this build argument
+ARG DOCKER_REGISTRY=docker.io
 
 # Step 1 - Run Maven Build
-FROM dspace/dspace-dependencies:${DSPACE_VERSION} AS build
+FROM ${DOCKER_REGISTRY}/dspace/dspace-dependencies:${DSPACE_VERSION} AS build
 ARG TARGET_DIR=dspace-installer
 WORKDIR /app
 # The dspace-installer directory will be written to /install
@@ -30,15 +34,15 @@ RUN mvn --no-transfer-progress package && \
 RUN rm -rf /install/webapps/server/
 
 # Step 2 - Run Ant Deploy
-FROM eclipse-temurin:${JDK_VERSION} AS ant_build
+FROM docker.io/eclipse-temurin:${JDK_VERSION} AS ant_build
 ARG TARGET_DIR=dspace-installer
 # COPY the /install directory from 'build' container to /dspace-src in this container
 COPY --from=build /install /dspace-src
 WORKDIR /dspace-src
 # Create the initial install deployment using ANT
-ENV ANT_VERSION 1.10.12
-ENV ANT_HOME /tmp/ant-$ANT_VERSION
-ENV PATH $ANT_HOME/bin:$PATH
+ENV ANT_VERSION=1.10.12
+ENV ANT_HOME=/tmp/ant-$ANT_VERSION
+ENV PATH=$ANT_HOME/bin:$PATH
 # Need wget to install ant
 RUN apt-get update \
     && apt-get install -y --no-install-recommends wget \
@@ -51,7 +55,7 @@ RUN mkdir $ANT_HOME && \
 RUN ant init_installation update_configs update_code update_webapps
 
 # Step 3 - Start up DSpace via Runnable JAR
-FROM eclipse-temurin:${JDK_VERSION}
+FROM docker.io/eclipse-temurin:${JDK_VERSION}
 # NOTE: DSPACE_INSTALL must align with the "dspace.dir" default configuration.
 ENV DSPACE_INSTALL=/dspace
 # Copy the /dspace directory from 'ant_build' container to /dspace in this container
diff --git a/docker-compose-cli.yml b/docker-compose-cli.yml
index 91f89916d208..3e2c9ba6a50a 100644
--- a/docker-compose-cli.yml
+++ b/docker-compose-cli.yml
@@ -6,7 +6,7 @@ networks:
     external: true
 services:
   dspace-cli:
-    image: "${DOCKER_OWNER:-dspace}/dspace-cli:${DSPACE_VER:-latest}"
+    image: "${DOCKER_REGISTRY:-docker.io}/${DOCKER_OWNER:-dspace}/dspace-cli:${DSPACE_VER:-latest}"
     container_name: dspace-cli
     build:
       context: .
diff --git a/docker-compose.yml b/docker-compose.yml
index 6a930a8d31ec..ab4f8adc98c0 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -28,7 +28,7 @@ services:
       # from the host machine. This IP range MUST correspond to the 'dspacenet' subnet defined above.
       proxies__P__trusted__P__ipranges: '172.23.0'
       LOGGING_CONFIG: /dspace/config/log4j2-container.xml
-    image: "${DOCKER_OWNER:-dspace}/dspace:${DSPACE_VER:-latest-test}"
+    image: "${DOCKER_REGISTRY:-docker.io}/${DOCKER_OWNER:-dspace}/dspace:${DSPACE_VER:-latest-test}"
     build:
       context: .
       dockerfile: Dockerfile.test
@@ -64,7 +64,7 @@ services:
   dspacedb:
     container_name: dspacedb
     # Uses a custom Postgres image with pgcrypto installed
-    image: "${DOCKER_OWNER:-dspace}/dspace-postgres-pgcrypto:${DSPACE_VER:-latest}"
+    image: "${DOCKER_REGISTRY:-docker.io}/${DOCKER_OWNER:-dspace}/dspace-postgres-pgcrypto:${DSPACE_VER:-latest}"
     build:
       # Must build out of subdirectory to have access to install script for pgcrypto
       context: ./dspace/src/main/docker/dspace-postgres-pgcrypto/
@@ -84,7 +84,7 @@ services:
   # DSpace Solr container
   dspacesolr:
     container_name: dspacesolr
-    image: "${DOCKER_OWNER:-dspace}/dspace-solr:${DSPACE_VER:-latest}"
+    image: "${DOCKER_REGISTRY:-docker.io}/${DOCKER_OWNER:-dspace}/dspace-solr:${DSPACE_VER:-latest}"
     build:
       context: ./dspace/src/main/docker/dspace-solr/
       # Provide path to Solr configs necessary to build Docker image
diff --git a/dspace/src/main/docker/dspace-postgres-pgcrypto-curl/Dockerfile b/dspace/src/main/docker/dspace-postgres-pgcrypto-curl/Dockerfile
index aabf87df3eda..791242f5bdc7 100644
--- a/dspace/src/main/docker/dspace-postgres-pgcrypto-curl/Dockerfile
+++ b/dspace/src/main/docker/dspace-postgres-pgcrypto-curl/Dockerfile
@@ -13,7 +13,7 @@
 ARG POSTGRES_VERSION=15
 ARG POSTGRES_PASSWORD=dspace
 
-FROM postgres:${POSTGRES_VERSION}
+FROM docker.io/postgres:${POSTGRES_VERSION}
 
 ENV POSTGRES_DB dspace
 ENV POSTGRES_USER dspace
diff --git a/dspace/src/main/docker/dspace-postgres-pgcrypto/Dockerfile b/dspace/src/main/docker/dspace-postgres-pgcrypto/Dockerfile
index 2298cd4e76ea..116d2dbcda31 100644
--- a/dspace/src/main/docker/dspace-postgres-pgcrypto/Dockerfile
+++ b/dspace/src/main/docker/dspace-postgres-pgcrypto/Dockerfile
@@ -13,7 +13,7 @@
 ARG POSTGRES_VERSION=15
 ARG POSTGRES_PASSWORD=dspace
 
-FROM postgres:${POSTGRES_VERSION}
+FROM docker.io/postgres:${POSTGRES_VERSION}
 
 ENV POSTGRES_DB dspace
 ENV POSTGRES_USER dspace
diff --git a/dspace/src/main/docker/dspace-shibboleth/Dockerfile b/dspace/src/main/docker/dspace-shibboleth/Dockerfile
index 79f2921bd7d6..25fb510e3d39 100644
--- a/dspace/src/main/docker/dspace-shibboleth/Dockerfile
+++ b/dspace/src/main/docker/dspace-shibboleth/Dockerfile
@@ -10,7 +10,7 @@
 # Build from Ubuntu as it has easy Apache tooling (e.g. a2enmod script is debian only).
 # Apache & mod_shib are required for DSpace to act as an SP
 # See also https://wiki.lyrasis.org/display/DSDOC7x/Authentication+Plugins#AuthenticationPlugins-ShibbolethAuthentication
-FROM ubuntu:20.04
+FROM docker.io/ubuntu:20.04
 
 # Apache ENVs (default values)
 ENV APACHE_RUN_USER www-data
diff --git a/dspace/src/main/docker/dspace-solr/Dockerfile b/dspace/src/main/docker/dspace-solr/Dockerfile
index 289949922cc1..241a4345b305 100644
--- a/dspace/src/main/docker/dspace-solr/Dockerfile
+++ b/dspace/src/main/docker/dspace-solr/Dockerfile
@@ -12,7 +12,7 @@
 
 ARG SOLR_VERSION=8.11
 
-FROM solr:${SOLR_VERSION}-slim
+FROM docker.io/solr:${SOLR_VERSION}-slim
 
 ENV AUTHORITY_CONFIGSET_PATH=/opt/solr/server/solr/configsets/authority/conf \
     OAI_CONFIGSET_PATH=/opt/solr/server/solr/configsets/oai/conf \