diff --git a/django/db/models/lookups.py b/django/db/models/lookups.py
index 1407a0562e..4c8e9e31fe 100644
--- a/django/db/models/lookups.py
+++ b/django/db/models/lookups.py
@@ -1,13 +1,10 @@
 import itertools
 import math
 from copy import copy
-from decimal import Decimal
 
 from django.core.exceptions import EmptyResultSet
 from django.db.models.expressions import Func, Value
-from django.db.models.fields import (
-    DateTimeField, DecimalField, Field, IntegerField,
-)
+from django.db.models.fields import DateTimeField, Field, IntegerField
 from django.db.models.query_utils import RegisterLookupMixin
 from django.utils.functional import cached_property
 
@@ -298,40 +295,6 @@ class IntegerLessThan(IntegerFieldFloatRounding, LessThan):
     pass
 
 
-class DecimalComparisonLookup:
-    def as_sqlite(self, compiler, connection):
-        lhs_sql, params = self.process_lhs(compiler, connection)
-        rhs_sql, rhs_params = self.process_rhs(compiler, connection)
-        params.extend(rhs_params)
-        # For comparisons whose lhs is a DecimalField, cast rhs AS NUMERIC
-        # because the rhs will have been converted to a string by the
-        # rev_typecast_decimal() adapter.
-        if isinstance(self.rhs, Decimal):
-            rhs_sql = 'CAST(%s AS NUMERIC)' % rhs_sql
-        rhs_sql = self.get_rhs_op(connection, rhs_sql)
-        return '%s %s' % (lhs_sql, rhs_sql), params
-
-
-@DecimalField.register_lookup
-class DecimalGreaterThan(DecimalComparisonLookup, GreaterThan):
-    pass
-
-
-@DecimalField.register_lookup
-class DecimalGreaterThanOrEqual(DecimalComparisonLookup, GreaterThanOrEqual):
-    pass
-
-
-@DecimalField.register_lookup
-class DecimalLessThan(DecimalComparisonLookup, LessThan):
-    pass
-
-
-@DecimalField.register_lookup
-class DecimalLessThanOrEqual(DecimalComparisonLookup, LessThanOrEqual):
-    pass
-
-
 @Field.register_lookup
 class In(FieldGetDbPrepValueIterableMixin, BuiltinLookup):
     lookup_name = 'in'