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diff --git a/include/git/oid.h b/include/git/oid.h
new file mode 100644
index 000000000..e0ed676cd
--- /dev/null
+++ b/include/git/oid.h
@@ -0,0 +1,76 @@
+/*
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Git Development Community nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef INCLUDE_git_oid_h__
+#define INCLUDE_git_oid_h__
+
+#include "git/common.h"
+
+/**
+ * @file git/oid.h
+ * @brief Git object id routines
+ * @defgroup git_oid Git object id routines
+ * @ingroup Git
+ * @{
+ */
+GIT_BEGIN_DECL
+
+/** Unique identity of any object (commit, tree, blob, tag). */
+typedef struct
+{
+	/** raw binary formatted id */
+	unsigned char id[20];
+} git_oid;
+
+/**
+ * Parse a hex formatted object id into a git_oid.
+ * @param out oid structure the result is written into.
+ * @param str input hex string; must be pointing at the start of
+ *        the hex sequence and have at least the number of bytes
+ *        needed for an oid encoded in hex (40 bytes).
+ * @return GIT_SUCCESS if valid; GIT_ENOTOID on failure.
+ */
+GIT_EXTERN(int) git_oid_mkstr(git_oid *out, const char *str);
+
+/**
+ * Copy an already raw oid into a git_oid structure.
+ * @param out oid structure the result is written into.
+ * @param raw the raw input bytes to be copied.
+ */
+GIT_EXTERN(void) git_oid_mkraw(git_oid *out, const unsigned char *raw);
+
+/** @} */
+GIT_END_DECL
+#endif