diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/FreebsdNativeAccess.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/FreebsdNativeAccess.java
new file mode 100644
index 0000000000000..d24bba0b3a736
--- /dev/null
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/FreebsdNativeAccess.java
@@ -0,0 +1,83 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.nativeaccess;
+
+import org.elasticsearch.nativeaccess.lib.BsdCLibrary;
+import org.elasticsearch.nativeaccess.lib.NativeLibraryProvider;
+import org.elasticsearch.nativeaccess.lib.PosixCLibrary;
+
+public class FreebsdNativeAccess extends PosixNativeAccess {
+
+    private final BsdCLibrary bsdLibc;
+    static final int RLIMIT_NPROC = 7;
+
+    // https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/sys/resource.h#L123
+    // https://man.freebsd.org/cgi/man.cgi?stat(2)
+    // https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/sys/stat.h#L159
+    // Offset of st_size: 112 bytes
+    // Offset of st_blocks: 120 bytes
+    FreebsdNativeAccess(NativeLibraryProvider libraryProvider) {
+        super("FreeBSD", libraryProvider,
+            new PosixConstants(
+                -1L,
+                10,
+                1,
+                6,
+                512,
+                144,
+                112,
+                120
+            )
+        );
+
+        this.bsdLibc = libraryProvider.getLibrary(BsdCLibrary.class);
+    }
+
+    // https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/sys/resource.h#L110
+    @Override
+    protected long getMaxThreads() {
+        return getRLimit(RLIMIT_NPROC, "max number of threads");
+    }
+
+    @Override
+    protected void logMemoryLimitInstructions() {
+        logger.warn("You can allow ElasticSearch to lock large amounts of RAM by setting the following in /etc/sysctl.conf:");
+        logger.warn("security.bsd.unprivileged_mlock=1\n");
+        logger.warn("You can also run the following command to modify the value immediately:");
+        logger.warn("sysctl security.bsd.unprivileged_mlock=1\n");
+        logger.warn("When running within a Jail, it's highly advisable to set:");
+        logger.warn("enforce_statfs = 1");
+    }
+
+    @Override
+    protected boolean nativePreallocate(int fd, long currentSize, long newSize) {
+        final int rc = bsdLibc.posix_fallocate(fd, currentSize, newSize - currentSize);
+        if (rc != 0) {
+            logger.warn("posix_fallocate failed: " + libc.strerror(libc.errno()));
+            return false;
+        }
+        return true;
+    }
+
+    // https://github.com/elastic/elasticsearch/blob/v8.15.5/server/src/main/java/org/elasticsearch/bootstrap/SystemCallFilter.java#L556
+    @Override
+    public void tryInstallExecSandbox() {
+        PosixCLibrary.RLimit limit = libc.newRLimit();
+        limit.rlim_cur(0);
+        limit.rlim_max(0);
+        if (libc.setrlimit(RLIMIT_NPROC, limit) != 0) {
+            throw new UnsupportedOperationException("RLIMIT_NPROC unavailable: " + libc.strerror(libc.errno()));
+        }
+
+        logger.debug("FreeBSD RLIMIT_NPROC initialization successful");
+
+        execSandboxState = ExecSandboxState.ALL_THREADS;
+    }
+}
diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/NativeAccessHolder.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/NativeAccessHolder.java
index e1c2b4c4cd8e3..c9f9db8daae7a 100644
--- a/libs/native/src/main/java/org/elasticsearch/nativeaccess/NativeAccessHolder.java
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/NativeAccessHolder.java
@@ -31,6 +31,8 @@ class NativeAccessHolder {
                 inst = new MacNativeAccess(libProvider);
             } else if (os.startsWith("Windows")) {
                 inst = new WindowsNativeAccess(libProvider);
+            } else if (os.startsWith("FreeBSD")) {
+                inst = new FreebsdNativeAccess(libProvider);
             } else {
                 logger.warn("Unsupported OS [" + os + "]. Native methods will be disabled.");
             }
diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/PosixNativeAccess.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/PosixNativeAccess.java
index a2188d0685c3b..03ac3e5459cb3 100644
--- a/libs/native/src/main/java/org/elasticsearch/nativeaccess/PosixNativeAccess.java
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/PosixNativeAccess.java
@@ -200,7 +200,8 @@ String rlimitToString(long value) {
     }
 
     static boolean isNativeVectorLibSupported() {
-        return Runtime.version().feature() >= 21 && (isMacOrLinuxAarch64() || isLinuxAmd64()) && checkEnableSystemProperty();
+        return Runtime.version().feature() >= 21 && (isMacOrLinuxAarch64() || isLinuxAmd64() || isFreebsdAmd64()) &&
+            checkEnableSystemProperty();
     }
 
     /**
@@ -217,6 +218,12 @@ static boolean isMacOrLinuxAarch64() {
         return (name.startsWith("Mac") || name.startsWith("Linux")) && System.getProperty("os.arch").equals("aarch64");
     }
 
+    /** Returns true if the OS is FreeBSD, and the architecture is x64. */
+    static boolean isFreebsdAmd64() {
+        String name = System.getProperty("os.name");
+        return (name.startsWith("FreeBSD")) && System.getProperty("os.arch").equals("amd64");
+    }
+
     /** -Dorg.elasticsearch.nativeaccess.enableVectorLibrary=false to disable.*/
     static final String ENABLE_JDK_VECTOR_LIBRARY = "org.elasticsearch.nativeaccess.enableVectorLibrary";
 
diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/BsdCLibrary.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/BsdCLibrary.java
new file mode 100644
index 0000000000000..f173c5e8b066a
--- /dev/null
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/BsdCLibrary.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.nativeaccess.lib;
+
+public non-sealed interface BsdCLibrary extends NativeLibrary {
+
+    int posix_fallocate(int fd, long offset, long length);
+}
diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/LoaderHelper.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/LoaderHelper.java
index d9c725f5a8d3b..6167f18c7664a 100644
--- a/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/LoaderHelper.java
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/LoaderHelper.java
@@ -36,6 +36,8 @@ private static Path findPlatformLibDir() {
             os = "linux";
         } else if (osname.startsWith("Mac OS")) {
             os = "darwin";
+        } else if (osname.startsWith("FreeBSD")) {
+            os = "freebsd";
         } else {
             os = "unsupported_os[" + osname + "]";
         }
diff --git a/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/NativeLibrary.java b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/NativeLibrary.java
index 943d8565f0897..4c9fa6b0a1505 100644
--- a/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/NativeLibrary.java
+++ b/libs/native/src/main/java/org/elasticsearch/nativeaccess/lib/NativeLibrary.java
@@ -11,4 +11,4 @@
 
 /** A marker interface for libraries that can be loaded by {@link org.elasticsearch.nativeaccess.lib.NativeLibraryProvider} */
 public sealed interface NativeLibrary permits JavaLibrary, PosixCLibrary, LinuxCLibrary, MacCLibrary, Kernel32Library, VectorLibrary,
-    ZstdLibrary {}
+    ZstdLibrary, BsdCLibrary {}
diff --git a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkFreebsdCLibrary.java b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkFreebsdCLibrary.java
new file mode 100644
index 0000000000000..7d1250f4def15
--- /dev/null
+++ b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkFreebsdCLibrary.java
@@ -0,0 +1,39 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.nativeaccess.jdk;
+
+import org.elasticsearch.nativeaccess.lib.BsdCLibrary;
+
+import java.lang.foreign.FunctionDescriptor;
+import java.lang.invoke.MethodHandle;
+
+import static java.lang.foreign.ValueLayout.JAVA_INT;
+import static java.lang.foreign.ValueLayout.JAVA_LONG;
+import static org.elasticsearch.nativeaccess.jdk.JdkPosixCLibrary.downcallHandleWithErrno;
+import static org.elasticsearch.nativeaccess.jdk.JdkPosixCLibrary.errnoState;
+
+public class JdkFreebsdCLibrary implements BsdCLibrary {
+
+    private static final MethodHandle posix_allocate$mh = downcallHandleWithErrno(
+        "posix_fallocate",
+        FunctionDescriptor.of(JAVA_INT, JAVA_INT, JAVA_LONG, JAVA_LONG)
+    );
+
+    // https://man.freebsd.org/cgi/man.cgi?query=posix_fallocate
+    // https://github.com/freebsd/freebsd-src/blob/release/14.2.0/sys/sys/fcntl.h#L390
+    @Override
+    public int posix_fallocate(int fd, long offset, long length) {
+        try {
+            return (int) posix_allocate$mh.invokeExact(errnoState, fd, offset, length);
+        } catch (Throwable t) {
+            throw new AssertionError(t);
+        }
+    }
+}
diff --git a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkNativeLibraryProvider.java b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkNativeLibraryProvider.java
index 1ac0780fcc460..e6e79ac5828bd 100644
--- a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkNativeLibraryProvider.java
+++ b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkNativeLibraryProvider.java
@@ -9,6 +9,7 @@
 
 package org.elasticsearch.nativeaccess.jdk;
 
+import org.elasticsearch.nativeaccess.lib.BsdCLibrary;
 import org.elasticsearch.nativeaccess.lib.JavaLibrary;
 import org.elasticsearch.nativeaccess.lib.Kernel32Library;
 import org.elasticsearch.nativeaccess.lib.LinuxCLibrary;
@@ -39,7 +40,9 @@ public JdkNativeLibraryProvider() {
                 ZstdLibrary.class,
                 JdkZstdLibrary::new,
                 VectorLibrary.class,
-                JdkVectorLibrary::new
+                JdkVectorLibrary::new,
+                BsdCLibrary.class,
+                JdkFreebsdCLibrary::new
             )
         );
     }
diff --git a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkPosixCLibrary.java b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkPosixCLibrary.java
index 727f271d3a0c0..ef63d6b668004 100644
--- a/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkPosixCLibrary.java
+++ b/libs/native/src/main21/java/org/elasticsearch/nativeaccess/jdk/JdkPosixCLibrary.java
@@ -79,8 +79,12 @@ class JdkPosixCLibrary implements PosixCLibrary {
     private static final MethodHandle fstat$mh;
     static {
         MethodHandle fstat;
+        String fstatFunc = "fstat64";
         try {
-            fstat = downcallHandleWithErrno("fstat64", FunctionDescriptor.of(JAVA_INT, JAVA_INT, ADDRESS));
+            if (System.getProperty("os.name").equals("FreeBSD")) {
+                fstatFunc = "fstat";
+            }
+            fstat = downcallHandleWithErrno(fstatFunc, FunctionDescriptor.of(JAVA_INT, JAVA_INT, ADDRESS));
         } catch (LinkageError e) {
             // Due to different sizes of the stat structure for 32 vs 64 bit machines, on some systems fstat actually points to
             // an internal symbol. So we fall back to looking for that symbol.