diff --git a/evmrpc/block.go b/evmrpc/block.go
index 22d31bc49b..f052542911 100644
--- a/evmrpc/block.go
+++ b/evmrpc/block.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/sha256"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"math/big"
 	"strings"
@@ -195,10 +196,18 @@ func (a *BlockAPI) GetBlockByHash(ctx context.Context, blockHash common.Hash, fu
 func (a *BlockAPI) getBlockByHash(ctx context.Context, blockHash common.Hash, fullTx bool, includeSyntheticTxs bool, isPanicTx func(ctx context.Context, hash common.Hash) (bool, error)) (result map[string]interface{}, returnErr error) {
 	startTime := time.Now()
 	defer recordMetricsWithError(fmt.Sprintf("%s_getBlockByHash", a.namespace), a.connectionType, startTime, returnErr)
+
+	// Ethereum spec: empty or non-existent block hash returns result=null, not error.
+	if blockHash == (common.Hash{}) {
+		return nil, nil
+	}
 	if blockHash == genesisBlockHash {
 		return encodeGenesisBlock(), nil
 	}
 	block, err := blockByHashRespectingWatermarks(ctx, a.tmClient, a.watermarks, blockHash[:], 1)
+	if errors.Is(err, ErrBlockNotFoundByHash) {
+		return nil, nil
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -260,8 +269,15 @@ func (a *BlockAPI) getBlockByNumber(
 func (a *BlockAPI) GetBlockReceipts(ctx context.Context, blockNrOrHash rpc.BlockNumberOrHash) (result []map[string]interface{}, returnErr error) {
 	startTime := time.Now()
 	defer recordMetricsWithError(fmt.Sprintf("%s_getBlockReceipts", a.namespace), a.connectionType, startTime, returnErr)
+	// Ethereum spec: empty or non-existent block hash returns result=null, not error.
+	if blockNrOrHash.BlockHash != nil && *blockNrOrHash.BlockHash == (common.Hash{}) {
+		return nil, nil
+	}
 	// Get height from params
 	heightPtr, err := GetBlockNumberByNrOrHash(ctx, a.tmClient, a.watermarks, blockNrOrHash)
+	if errors.Is(err, ErrBlockNotFoundByHash) {
+		return nil, nil
+	}
 	if err != nil {
 		return nil, err
 	}
diff --git a/evmrpc/height_availability_test.go b/evmrpc/height_availability_test.go
index f51ee8f310..d599d7bd5d 100644
--- a/evmrpc/height_availability_test.go
+++ b/evmrpc/height_availability_test.go
@@ -73,6 +73,19 @@ func (c *heightTestClient) Status(context.Context) (*coretypes.ResultStatus, err
 	}, nil
 }
 
+// blockNotFoundTestClient returns ResultBlock{Block: nil} for a specific hash to simulate Tendermint "block not found".
+type blockNotFoundTestClient struct {
+	*heightTestClient
+	notFoundHash bytes.HexBytes
+}
+
+func (c *blockNotFoundTestClient) BlockByHash(ctx context.Context, hash bytes.HexBytes) (*coretypes.ResultBlock, error) {
+	if hash.String() == c.notFoundHash.String() {
+		return &coretypes.ResultBlock{Block: nil}, nil
+	}
+	return c.heightTestClient.BlockByHash(ctx, hash)
+}
+
 func mustDecodeHex(h string) []byte {
 	bz, err := hex.DecodeString(h)
 	if err != nil {
@@ -100,6 +113,62 @@ func TestBlockAPIEnsureHeightUnavailable(t *testing.T) {
 	require.Contains(t, err.Error(), "requested height")
 }
 
+// TestGetBlockByHashNotFoundReturnsNull verifies Ethereum-compatible behavior: empty or non-existent block hash
+// returns (nil, nil) so RPC responds with result: null, not an error (see get-block-by-empty-hash.iox, get-block-by-notfound-hash.iox).
+func TestGetBlockByHashNotFoundReturnsNull(t *testing.T) {
+	t.Parallel()
+
+	earliest := int64(1)
+	latest := int64(100)
+	base := newHeightTestClient(latest+5, earliest, latest)
+	notFoundHashHex := "0x00000000000000000000000000000000000000000000000000000000deadbeef"
+	client := &blockNotFoundTestClient{
+		heightTestClient: base,
+		notFoundHash:     bytes.HexBytes(mustDecodeHex(notFoundHashHex[2:])),
+	}
+	watermarks := NewWatermarkManager(client, testCtxProvider, nil, nil)
+	api := NewBlockAPI(client, nil, testCtxProvider, testTxConfigProvider, ConnectionTypeHTTP, watermarks, nil, nil)
+	ctx := context.Background()
+
+	// Empty hash: short-circuit, result null
+	result, err := api.GetBlockByHash(ctx, common.Hash{}, false)
+	require.NoError(t, err)
+	require.Nil(t, result)
+
+	// Non-existent hash (client returns Block: nil): result null
+	result, err = api.GetBlockByHash(ctx, common.HexToHash(notFoundHashHex), false)
+	require.NoError(t, err)
+	require.Nil(t, result)
+}
+
+// TestGetBlockReceiptsNotFoundReturnsNull verifies Ethereum-compatible behavior: empty or non-existent block hash
+// returns (nil, nil) so RPC responds with result: null (see get-block-receipts-empty.iox, get-block-receipts-not-found.iox).
+func TestGetBlockReceiptsNotFoundReturnsNull(t *testing.T) {
+	t.Parallel()
+
+	earliest := int64(1)
+	latest := int64(100)
+	base := newHeightTestClient(latest+5, earliest, latest)
+	notFoundHashHex := "0x00000000000000000000000000000000000000000000000000000000deadbeef"
+	client := &blockNotFoundTestClient{
+		heightTestClient: base,
+		notFoundHash:     bytes.HexBytes(mustDecodeHex(notFoundHashHex[2:])),
+	}
+	watermarks := NewWatermarkManager(client, testCtxProvider, nil, nil)
+	api := NewBlockAPI(client, nil, testCtxProvider, testTxConfigProvider, ConnectionTypeHTTP, watermarks, nil, nil)
+	ctx := context.Background()
+
+	// Empty hash: short-circuit, result null
+	receipts, err := api.GetBlockReceipts(ctx, rpc.BlockNumberOrHashWithHash(common.Hash{}, true))
+	require.NoError(t, err)
+	require.Nil(t, receipts)
+
+	// Non-existent hash (client returns Block: nil): result null
+	receipts, err = api.GetBlockReceipts(ctx, rpc.BlockNumberOrHashWithHash(common.HexToHash(notFoundHashHex), true))
+	require.NoError(t, err)
+	require.Nil(t, receipts)
+}
+
 // TestGetBlockTransactionCountByHashGenesis verifies that the genesis block hash returned by
 // eth_getBlockByNumber("0x0") is accepted by eth_getBlockTransactionCountByHash (consistency).
 func TestGetBlockTransactionCountByHashGenesis(t *testing.T) {
diff --git a/evmrpc/utils.go b/evmrpc/utils.go
index 25042e763a..a6bc0dd8a4 100644
--- a/evmrpc/utils.go
+++ b/evmrpc/utils.go
@@ -5,6 +5,7 @@ import (
 	"crypto/ecdsa"
 	"crypto/sha256"
 	"encoding/hex"
+	"errors"
 	"fmt"
 	"math/big"
 	"runtime/debug"
@@ -41,6 +42,10 @@ const LatestCtxHeight int64 = -1
 // EVM launch block heights for different chains
 const Pacific1EVMLaunchHeight int64 = 79123881
 
+// ErrBlockNotFoundByHash is returned when no block exists for the given hash (e.g. empty or unknown hash).
+// Ethereum-compatible RPCs should return result: null for this case instead of an error.
+var ErrBlockNotFoundByHash = errors.New("block not found by hash")
+
 // GetBlockNumberByNrOrHash returns the height of the block with the given number or hash.
 func GetBlockNumberByNrOrHash(ctx context.Context, tmClient rpcclient.Client, wm *WatermarkManager, blockNrOrHash rpc.BlockNumberOrHash) (*int64, error) {
 	if blockNrOrHash.BlockHash != nil {
@@ -186,7 +191,7 @@ func blockByHashWithRetry(ctx context.Context, client rpcclient.Client, hash byt
 		return nil, err
 	}
 	if blockRes.Block == nil {
-		return nil, fmt.Errorf("could not find block for hash %s", hash.String())
+		return nil, ErrBlockNotFoundByHash
 	}
 	TraceTendermintIfApplicable(ctx, "BlockByHash", []string{hash.String()}, blockRes)
 	return blockRes, err