diff --git a/pkg/core/native/native_neo.go b/pkg/core/native/native_neo.go
index 2a3a2faa1..237479c06 100644
--- a/pkg/core/native/native_neo.go
+++ b/pkg/core/native/native_neo.go
@@ -96,6 +96,11 @@ func NewNEO() *NEO {
 	md = newMethodAndPrice(n.registerCandidate, 5000000, smartcontract.AllowModifyStates)
 	n.AddMethod(md, desc, false)
 
+	desc = newDescriptor("unregisterCandidate", smartcontract.BoolType,
+		manifest.NewParameter("pubkey", smartcontract.PublicKeyType))
+	md = newMethodAndPrice(n.unregisterCandidate, 5000000, smartcontract.AllowModifyStates)
+	n.AddMethod(md, desc, false)
+
 	desc = newDescriptor("vote", smartcontract.BoolType,
 		manifest.NewParameter("account", smartcontract.Hash160Type),
 		manifest.NewParameter("pubkey", smartcontract.PublicKeyType))
@@ -237,6 +242,28 @@ func (n *NEO) RegisterCandidateInternal(ic *interop.Context, pub *keys.PublicKey
 	return ic.DAO.PutStorageItem(n.ContractID, key, si)
 }
 
+func (n *NEO) unregisterCandidate(ic *interop.Context, args []stackitem.Item) stackitem.Item {
+	err := n.UnregisterCandidateInternal(ic, toPublicKey(args[0]))
+	return stackitem.NewBool(err == nil)
+}
+
+// UnregisterCandidateInternal unregisters pub as a candidate.
+func (n *NEO) UnregisterCandidateInternal(ic *interop.Context, pub *keys.PublicKey) error {
+	key := makeValidatorKey(pub)
+	si := ic.DAO.GetStorageItem(n.ContractID, key)
+	if si == nil {
+		return nil
+	}
+	n.validators.Store(keys.PublicKeys(nil))
+	c := new(candidate).FromBytes(si.Value)
+	if c.Votes.Sign() == 0 {
+		return ic.DAO.DeleteStorageItem(n.ContractID, key)
+	}
+	c.Registered = false
+	si.Value = c.Bytes()
+	return ic.DAO.PutStorageItem(n.ContractID, key, si)
+}
+
 func (n *NEO) vote(ic *interop.Context, args []stackitem.Item) stackitem.Item {
 	acc := toUint160(args[0])
 	var pub *keys.PublicKey
diff --git a/pkg/core/native_neo_test.go b/pkg/core/native_neo_test.go
index 72da75bb9..8ef63432d 100644
--- a/pkg/core/native_neo_test.go
+++ b/pkg/core/native_neo_test.go
@@ -92,4 +92,13 @@ func TestNEO_Vote(t *testing.T) {
 	pubs, err = neo.GetValidatorsInternal(bc, ic.DAO)
 	require.NoError(t, err)
 	require.Equal(t, candidates, pubs)
+
+	require.NoError(t, neo.UnregisterCandidateInternal(ic, candidates[0]))
+	require.Error(t, neo.VoteInternal(ic, h, candidates[0]))
+
+	pubs, err = neo.GetValidatorsInternal(bc, ic.DAO)
+	require.NoError(t, err)
+	for i := range pubs {
+		require.NotEqual(t, candidates[0], pubs[i])
+	}
 }