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diff --git a/tests/zfs-tests/tests/functional/mmap/mmap_mixed.ksh b/tests/zfs-tests/tests/functional/mmap/mmap_mixed.ksh
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+++ b/tests/zfs-tests/tests/functional/mmap/mmap_mixed.ksh
@@ -0,0 +1,86 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# The contents of this file are subject to the terms of the
+# Common Development and Distribution License (the "License").
+# You may not use this file except in compliance with the License.
+#
+# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+# or https://opensource.org/licenses/CDDL-1.0.
+# See the License for the specific language governing permissions
+# and limitations under the License.
+#
+# When distributing Covered Code, include this CDDL HEADER in each
+# file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+# If applicable, add the following below this CDDL HEADER, with the
+# fields enclosed by brackets "[]" replaced with your own identifying
+# information: Portions Copyright [yyyy] [name of copyright owner]
+#
+# CDDL HEADER END
+#
+
+#
+# Copyright (c) 2023 by Lawrence Livermore National Security, LLC.
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/mmap/mmap.cfg
+
+#
+# DESCRIPTION:
+# 	Verify mixed buffered and mmap IO.
+#
+# STRATEGY:
+#	1. Create an empty file.
+#	2. Start a background buffered read/write fio to the file.
+#	3. Start a background mmap read/write fio to the file.
+#
+
+verify_runnable "global"
+
+function cleanup
+{
+	log_must rm -f "$tmp_file"
+}
+
+log_assert "Verify mixed buffered and mmap IO"
+
+log_onexit cleanup
+
+mntpnt=$(get_prop mountpoint $TESTPOOL/$TESTFS)
+tmp_file=$mntpnt/file
+bs=$((128 * 1024))
+blocks=64
+size=$((bs * blocks))
+runtime=60
+
+log_must dd if=/dev/zero of=$tmp_file bs=$bs count=$blocks
+
+# Buffered IO writes
+log_must eval "fio --filename=$tmp_file --name=buffer-write \
+	--rw=randwrite --size=$size --bs=$bs --direct=0 --numjobs=1 \
+	--ioengine=sync --fallocate=none --group_reporting --minimal \
+	--runtime=$runtime --time_based --norandommap &"
+
+# Buffered IO reads
+log_must eval "fio --filename=$tmp_file --name=buffer-read \
+	--rw=randread --size=$size --bs=$bs --direct=0 --numjobs=1 \
+	--ioengine=sync --fallocate=none --group_reporting --minimal \
+	--runtime=$runtime --time_based --norandommap &"
+
+# mmap IO writes
+log_must eval "fio --filename=$tmp_file --name=mmap-write \
+	--rw=randwrite --size=$size --bs=$bs --numjobs=1 \
+	--ioengine=mmap --fallocate=none --group_reporting --minimal \
+	--runtime=$runtime --time_based --norandommap &"
+
+# mmap IO reads
+log_must eval "fio --filename=$tmp_file --name=mmap-read \
+	--rw=randread --size=$size --bs=$bs --numjobs=1 \
+	--ioengine=mmap --fallocate=none --group_reporting --minimal \
+	--runtime=$runtime --time_based --norandommap &"
+
+log_must wait
+
+log_pass "Verfied mixed buffered and mmap IO"