diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b49d072..9b252b5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -75,7 +75,7 @@ jobs:
           - riscv32gc-unknown-linux-gnu # tier3
           - riscv64gc-unknown-linux-gnu
           - s390x-unknown-linux-gnu
-          # - sparc-unknown-linux-gnu # tier3, supported in rust-cross-toolchain but not ported to this action
+          - sparc-unknown-linux-gnu # tier3
           - sparc64-unknown-linux-gnu
           - thumbv7neon-unknown-linux-gnueabihf
           - x86_64-unknown-linux-gnu
@@ -217,6 +217,7 @@ jobs:
           - { target: mipsisa32r6-unknown-linux-gnu, os: ubuntu-20.04 }
           - { target: mipsisa64r6-unknown-linux-gnuabi64, os: ubuntu-20.04 }
           - { target: powerpc64-unknown-linux-gnu, os: ubuntu-20.04 }
+          - { target: sparc-unknown-linux-gnu, os: ubuntu-20.04 }
           - { target: sparc64-unknown-linux-gnu, os: ubuntu-20.04 }
     runs-on: ${{ matrix.os || 'ubuntu-latest' }}
     timeout-minutes: 60
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2b4a696..41dc81c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 ## [Unreleased]
 
 - Support i686-pc-windows-gnullvm.
+- Support sparc-unknown-linux-gnu (experimental).
 
 ## [1.17.0] - 2023-08-24
 
diff --git a/README.md b/README.md
index 0453925..18ec091 100644
--- a/README.md
+++ b/README.md
@@ -211,6 +211,7 @@ jobs:
 | `riscv32gc-unknown-linux-gnu`          | Ubuntu (20.04, 18.04, 22.04) [5]                 | qemu-user                   |       |
 | `riscv64gc-unknown-linux-gnu`          | ubuntu (<!-- 20.04 [1], 18.04 [2], -->22.04 [3]) | qemu-user                   |       |
 | `s390x-unknown-linux-gnu`              | Ubuntu (20.04 [1], 18.04 [2], 22.04 [3])         | qemu-user                   |       |
+| `sparc-unknown-linux-gnu`              | Ubuntu (<!-- 20.04 [1], -->18.04 [2], 22.04 [3]) | qemu-user                   | tier3, experimental |
 | `sparc64-unknown-linux-gnu`            | Ubuntu (<!-- 20.04 [1], -->18.04 [2], 22.04 [3]) | qemu-user                   |       |
 | `thumbv7neon-unknown-linux-gnueabihf`  | Ubuntu (20.04 [1], 18.04 [2], 22.04 [3])         | qemu-user                   |       |
 | `x86_64-unknown-linux-gnu`             | Ubuntu (20.04 [1], 18.04 [2], 22.04 [3])         | native (default), qemu-user |       |
diff --git a/main.sh b/main.sh
index f85239b..483040a 100755
--- a/main.sh
+++ b/main.sh
@@ -297,17 +297,14 @@ setup_linux_host() {
                         # https://github.com/taiki-e/rust-cross-toolchain/blob/a92f4cc85408460235b024933451f0350e08b726/docker/linux-gnu.sh#L55
                         bail "target '${target}' not yet supported; consider using armv7-unknown-linux-gnueabihf for testing armhf or arm-unknown-linux-gnueabi for testing armv6"
                         ;;
-                    sparc-unknown-linux-gnu)
-                        # (tier3) Setup is tricky.
-                        # https://github.com/taiki-e/rust-cross-toolchain/blob/a92f4cc85408460235b024933451f0350e08b726/docker/linux-gnu.Dockerfile#L44
-                        bail "target '${target}' not yet supported"
-                        ;;
                     *)
                         case "${target}" in
                             arm*hf | thumbv7neon-*) cc_target=arm-linux-gnueabihf ;;
                             arm*) cc_target=arm-linux-gnueabi ;;
                             riscv32gc-* | riscv64gc-*) cc_target="${target/gc-unknown/}" ;;
                             sparc-*)
+                                # Toolchain for sparc-linux-gnu is not available in APT,
+                                # but we can use -m32 with sparc64-linux-gnu multilib.
                                 cc_target=sparc-linux-gnu
                                 apt_target=sparc64-linux-gnu
                                 multilib=1
@@ -319,10 +316,23 @@ setup_linux_host() {
                         apt_packages+=("g++-${multilib:+multilib-}${apt_target/_/-}")
                         # https://github.com/taiki-e/rust-cross-toolchain/blob/fcb7a7e6ca14333d93c528f34a1def5a38745b3a/docker/test/entrypoint.sh
                         sysroot_dir="/usr/${apt_target}"
-                        cat >>"${GITHUB_ENV}" <<EOF
+                        case "${target}" in
+                            sparc-*)
+                                cat >>"${GITHUB_ENV}" <<EOF
+CARGO_TARGET_${target_upper}_LINKER=${target}-gcc
+CC_${target_lower}=${target}-gcc
+CXX_${target_lower}=${target}-g++
+EOF
+                                ;;
+                            *)
+                                cat >>"${GITHUB_ENV}" <<EOF
 CARGO_TARGET_${target_upper}_LINKER=${apt_target}-gcc
 CC_${target_lower}=${apt_target}-gcc
 CXX_${target_lower}=${apt_target}-g++
+EOF
+                                ;;
+                        esac
+                        cat >>"${GITHUB_ENV}" <<EOF
 AR_${target_lower}=${apt_target}-ar
 RANLIB_${target_lower}=${apt_target}-ranlib
 STRIP=${apt_target}-strip
@@ -657,6 +667,31 @@ EOF
     fi
 
     install_apt_packages
+
+    case "${target}" in
+        sparc-unknown-linux-gnu)
+            # https://github.com/taiki-e/rust-cross-toolchain/blob/a92f4cc85408460235b024933451f0350e08b726/docker/linux-gnu.Dockerfile#L44
+            # The interpreter for sparc-linux-gnu is /lib/ld-linux.so.2,
+            # so lib/ld-linux.so.2 must be target sparc-linux-gnu to run binaries on qemu-user.
+            toolchain_dir=/usr
+            sudo rm -rf "${toolchain_dir:?}/${apt_target}/lib"
+            sudo rm -rf "${toolchain_dir:?}/${apt_target}/lib64"
+            sudo ln -s lib32 "${toolchain_dir}/${apt_target}/lib"
+            gcc_version="$(gcc --version | sed -n '1 s/^.*) //p')"
+            common_flags="-m32 -mv8plus -L${toolchain_dir}/${apt_target}/lib32 -L${toolchain_dir}/${apt_target}/lib/gcc-cross/${apt_target}/${gcc_version}/32"
+            cat >"/usr/local/bin/${target}-gcc" <<EOF2
+#!/bin/sh
+set -eu
+exec ${toolchain_dir}/bin/${apt_target}-gcc ${common_flags} "\$@"
+EOF2
+            cat >"/usr/local/bin/${target}-g++" <<EOF2
+#!/bin/sh
+set -eu
+exec ${toolchain_dir}/bin/${apt_target}-g++ ${common_flags} "\$@"
+EOF2
+            chmod +x "/usr/local/bin/${target}-gcc" "/usr/local/bin/${target}-g++"
+            ;;
+    esac
 }
 
 case "${host}" in