diff --git a/src/pkgcheck/checks/reserved.py b/src/pkgcheck/checks/reserved.py
new file mode 100644
index 000000000..3543a1fb2
--- /dev/null
+++ b/src/pkgcheck/checks/reserved.py
@@ -0,0 +1,94 @@
+import re
+from .. import addons, bash, results, sources
+from . import Check
+
+
+class _ReservedNameCheck(Check):
+    reserved_prefixes = ('__', 'abort', 'dyn', 'prep')
+    reserved_substrings = ('hook', 'paludis', 'portage')  # 'ebuild' is special case
+    reserved_ebuild_regex = re.compile(r'(.*[^a-zA-Z])?ebuild.*')
+
+    """Portage variables whose use is half-legitimate and harmless if the package manager doesn't support them."""
+    special_whitelist = ('EBUILD_DEATH_HOOKS', 'EBUILD_SUCCESS_HOOKS', 'PORTAGE_QUIET')
+
+    def _check(self, used_type: str, used_names):
+        for used_name, node_start in used_names.items():
+            if used_name in self.special_whitelist:
+                continue
+            test_name = used_name.lower()
+            lineno, _ = node_start
+            for reserved in self.reserved_prefixes:
+                if test_name.startswith(reserved):
+                    yield used_name, used_type, reserved, 'prefix', lineno
+            for reserved in self.reserved_substrings:
+                if reserved in test_name:
+                    yield used_name, used_type, reserved, 'substring', lineno
+            if self.reserved_ebuild_regex.match(test_name):
+                yield used_name, used_type, 'ebuild', 'substring', lineno
+
+    def _feed(self, item):
+        yield from self._check('function', {
+            item.node_str(node.child_by_field_name('name')): node.start_point
+            for node, _ in bash.func_query.captures(item.tree.root_node)
+        })
+        yield from self._check('variable', {
+            item.node_str(node.child_by_field_name('name')): node.start_point
+            for node, _ in bash.var_assign_query.captures(item.tree.root_node)
+        })
+
+
+class EclassReservedName(results.EclassResult, results.Warning):
+    """Eclass uses reserved variable or function name for package manager."""
+
+    def __init__(self, used_name: str, used_type: str, reserved_word: str, reserved_type: str, **kwargs):
+        super().__init__(**kwargs)
+        self.used_name = used_name
+        self.used_type = used_type
+        self.reserved_word = reserved_word
+        self.reserved_type = reserved_type
+
+    @property
+    def desc(self):
+        return f'{self.eclass}: {self.used_type} name "{self.used_name}" is disallowed because "{self.reserved_word}" is a reserved {self.reserved_type}'
+
+
+class EclassReservedCheck(_ReservedNameCheck):
+    """Scan eclasses for reserved function or variable names."""
+
+    _source = sources.EclassParseRepoSource
+    known_results = frozenset([EclassReservedName])
+    required_addons = (addons.eclass.EclassAddon,)
+
+    def __init__(self, *args, eclass_addon):
+        super().__init__(*args)
+        self.eclass_cache = eclass_addon.eclasses
+
+    def feed(self, eclass):
+        for *args, _ in self._feed(eclass):
+            yield EclassReservedName(*args, eclass=eclass.name)
+
+
+class EbuildReservedName(results.LineResult, results.Warning):
+    """Ebuild uses reserved variable or function name for package manager."""
+
+    def __init__(self, used_name: str, used_type: str, reserved_word: str, reserved_type: str, **kwargs):
+        super().__init__(**kwargs)
+        self.used_name = used_name
+        self.used_type = used_type
+        self.reserved_word = reserved_word
+        self.reserved_type = reserved_type
+
+    @property
+    def desc(self):
+        return f'line {self.lineno}: {self.used_type} name "{self.used_name}" is disallowed because "{self.reserved_word}" is a reserved {self.reserved_type}'
+
+
+class EbuildReservedCheck(_ReservedNameCheck):
+    """Scan ebuilds for reserved function or variable names."""
+
+    _source = sources.EbuildParseRepoSource
+    known_results = frozenset([EbuildReservedName])
+
+    def feed(self, pkg):
+        for *args, lineno in self._feed(pkg):
+            yield EbuildReservedName(*args, lineno=lineno, line='', pkg=pkg)
diff --git a/testdata/data/repos/eclass/EclassReservedCheck/EclassReservedName/expected.json b/testdata/data/repos/eclass/EclassReservedCheck/EclassReservedName/expected.json
new file mode 100644
index 000000000..3e0e439a5
--- /dev/null
+++ b/testdata/data/repos/eclass/EclassReservedCheck/EclassReservedName/expected.json
@@ -0,0 +1,2 @@
+{"__class__": "EclassReservedName", "eclass": "reserved", "used_name": "prepare_locale", "used_type": "function", "reserved_word": "prep", "reserved_type": "prefix"}
+{"__class__": "EclassReservedName", "eclass": "reserved", "used_name": "EBUILD_TEST", "used_type": "variable", "reserved_word": "ebuild", "reserved_type": "substring"}
diff --git a/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/expected.json b/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/expected.json
new file mode 100644
index 000000000..1dd73cac9
--- /dev/null
+++ b/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/expected.json
@@ -0,0 +1,5 @@
+{"__class__": "EbuildReservedName", "category": "EbuildReservedCheck", "package": "EbuildReservedName", "version": "0", "used_name": "prepare_locale", "used_type": "function", "reserved_word": "prep", "reserved_type": "prefix", "lineno": 5, "line": ""}
+{"__class__": "EbuildReservedName", "category": "EbuildReservedCheck", "package": "EbuildReservedName", "version": "0", "used_name": "DYNAMIC_DEPS", "used_type": "variable", "reserved_word": "dyn", "reserved_type": "prefix", "lineno": 6, "line": ""}
+{"__class__": "EbuildReservedName", "category": "EbuildReservedCheck", "package": "EbuildReservedName", "version": "0", "used_name": "_hook_prepare", "used_type": "variable", "reserved_word": "hook", "reserved_type": "substring", "lineno": 7, "line": ""}
+{"__class__": "EbuildReservedName", "category": "EbuildReservedCheck", "package": "EbuildReservedName", "version": "0", "used_name": "__ORIG_CC", "used_type": "variable", "reserved_word": "__", "reserved_type": "prefix", "lineno": 10, "line": ""}
+{"__class__": "EbuildReservedName", "category": "EbuildReservedCheck", "package": "EbuildReservedName", "version": "0", "used_name": "EBUILD_TEST", "used_type": "variable", "reserved_word": "ebuild", "reserved_type": "substring", "lineno": 12, "line": ""}
diff --git a/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/fix.patch b/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/fix.patch
new file mode 100644
index 000000000..146e025e0
--- /dev/null
+++ b/testdata/data/repos/standalone/EbuildReservedCheck/EbuildReservedName/fix.patch
@@ -0,0 +1,19 @@
+--- standalone/EbuildReservedCheck/EbuildReservedName/EbuildReservedName-0.ebuild
++++ standalone/EbuildReservedCheck/EbuildReservedName/EbuildReservedName-0.ebuild
+@@ -3,12 +3,11 @@ HOMEPAGE="https://github.com/pkgcore/pkgcheck"
+ SLOT="0"
+ LICENSE="BSD"
+
+-prepare_locale() {
+-	DYNAMIC_DEPS="2"
+-	_hook_prepare="3"
++my_prepare_locale() {
++	MY_DYNAMIC_DEPS="2"
++	_my_prepare="3"
+ }
+
+-__ORIG_CC="STUB"
++MY_ORIG_CC="STUB"
+ EBUILD_SUCCESS_HOOKS="true"
+-EBUILD_TEST="1"
+ REBUILD_ALL="1"
diff --git a/testdata/repos/eclass/eclass/reserved.eclass b/testdata/repos/eclass/eclass/reserved.eclass
new file mode 100644
index 000000000..5c29e6658
--- /dev/null
+++ b/testdata/repos/eclass/eclass/reserved.eclass
@@ -0,0 +1,21 @@
+# @ECLASS: reserved.eclass
+# @MAINTAINER:
+# Larry the Cow <larry@example.org>
+# @AUTHOR:
+# Larry the Cow <larry@example.org>
+# @BLURB: Stub eclass.
+
+# @FUNCTION: prepare_locale
+# @USAGE:
+# @DESCRIPTION:
+# Public stub function.
+prepare_locale() {
+	local DYNAMIC_DEPS
+	local prepered
+	export EBUILD_DEATH_HOOKS="die"
+}
+
+# @ECLASS_VARIABLE: EBUILD_TEST
+# @DESCRIPTION:
+# Public stub function.
+EBUILD_TEST="1"
diff --git a/testdata/repos/standalone/EbuildReservedCheck/EbuildReservedName/EbuildReservedName-0.ebuild b/testdata/repos/standalone/EbuildReservedCheck/EbuildReservedName/EbuildReservedName-0.ebuild
new file mode 100644
index 000000000..420f4dac7
--- /dev/null
+++ b/testdata/repos/standalone/EbuildReservedCheck/EbuildReservedName/EbuildReservedName-0.ebuild
@@ -0,0 +1,14 @@
+DESCRIPTION="Ebuild with reserved names"
+HOMEPAGE="https://github.com/pkgcore/pkgcheck"
+SLOT="0"
+LICENSE="BSD"
+
+prepare_locale() {
+	DYNAMIC_DEPS="2"
+	_hook_prepare="3"
+}
+
+__ORIG_CC="STUB"
+EBUILD_SUCCESS_HOOKS="true"
+EBUILD_TEST="1"
+REBUILD_ALL="1"