diff --git a/chainreg/chainparams.go b/chainreg/chainparams.go
index 33006d5a2..166a1fec5 100644
--- a/chainreg/chainparams.go
+++ b/chainreg/chainparams.go
@@ -22,6 +22,14 @@ var BitcoinTestNetParams = BitcoinNetParams{
 	CoinType: keychain.CoinTypeTestnet,
 }
 
+// BitcoinTestNet4Params contains parameters specific to the 4th version of the
+// test network.
+var BitcoinTestNet4Params = BitcoinNetParams{
+	Params:   &bitcoinCfg.TestNet4Params,
+	RPCPort:  "48334",
+	CoinType: keychain.CoinTypeTestnet,
+}
+
 // BitcoinMainNetParams contains parameters specific to the current Bitcoin
 // mainnet.
 var BitcoinMainNetParams = BitcoinNetParams{
@@ -53,8 +61,9 @@ var BitcoinRegTestNetParams = BitcoinNetParams{
 	CoinType: keychain.CoinTypeTestnet,
 }
 
-// IsTestnet tests if the givern params correspond to a testnet
-// parameter configuration.
+// IsTestnet tests if the given params correspond to a testnet parameter
+// configuration.
 func IsTestnet(params *BitcoinNetParams) bool {
-	return params.Params.Net == bitcoinWire.TestNet3
+	return params.Params.Net == bitcoinWire.TestNet3 ||
+		params.Params.Net == bitcoinWire.TestNet4
 }
diff --git a/chainreg/chainregistry.go b/chainreg/chainregistry.go
index a9a9ede70..3f9f738b2 100644
--- a/chainreg/chainregistry.go
+++ b/chainreg/chainregistry.go
@@ -838,6 +838,15 @@ var (
 		0x01, 0xea, 0x33, 0x09, 0x00, 0x00, 0x00, 0x00,
 	})
 
+	// BitcoinTestnet4Genesis is the genesis hash of Bitcoin's testnet4
+	// chain.
+	BitcoinTestnet4Genesis = chainhash.Hash([chainhash.HashSize]byte{
+		0x43, 0xf0, 0x8b, 0xda, 0xb0, 0x50, 0xe3, 0x5b,
+		0x56, 0x7c, 0x86, 0x4b, 0x91, 0xf4, 0x7f, 0x50,
+		0xae, 0x72, 0x5a, 0xe2, 0xde, 0x53, 0xbc, 0xfb,
+		0xba, 0xf2, 0x84, 0xda, 0x00, 0x00, 0x00, 0x00,
+	})
+
 	// BitcoinSignetGenesis is the genesis hash of Bitcoin's signet chain.
 	BitcoinSignetGenesis = chainhash.Hash([chainhash.HashSize]byte{
 		0xf6, 0x1e, 0xee, 0x3b, 0x63, 0xa3, 0x80, 0xa4,
diff --git a/cmd/commands/main.go b/cmd/commands/main.go
index 71a8531d9..ec593f1ad 100644
--- a/cmd/commands/main.go
+++ b/cmd/commands/main.go
@@ -286,7 +286,7 @@ func contextWithMetadata(ctx context.Context,
 func extractPathArgs(ctx *cli.Context) (string, string, error) {
 	network := strings.ToLower(ctx.GlobalString("network"))
 	switch network {
-	case "mainnet", "testnet", "regtest", "simnet", "signet":
+	case "mainnet", "testnet", "testnet4", "regtest", "simnet", "signet":
 	default:
 		return "", "", fmt.Errorf("unknown network: %v", network)
 	}
@@ -386,8 +386,9 @@ func Main() {
 		},
 		cli.StringFlag{
 			Name: "network, n",
-			Usage: "The network lnd is running on, e.g. mainnet, " +
-				"testnet, etc.",
+			Usage: "The network lnd is running on; valid values " +
+				"are: mainnet, testnet, testnet4, regtest, " +
+				"signet and simnet.",
 			Value:  "mainnet",
 			EnvVar: envVarNetwork,
 		},
@@ -555,9 +556,12 @@ func networkParams(ctx *cli.Context) (*chaincfg.Params, error) {
 	case "mainnet":
 		return &chaincfg.MainNetParams, nil
 
-	case "testnet":
+	case "testnet", "testnet3":
 		return &chaincfg.TestNet3Params, nil
 
+	case "testnet4":
+		return &chaincfg.TestNet4Params, nil
+
 	case "regtest":
 		return &chaincfg.RegressionNetParams, nil
 
diff --git a/config.go b/config.go
index be0838be2..2390a3ee2 100644
--- a/config.go
+++ b/config.go
@@ -1208,6 +1208,10 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 		numNets++
 		cfg.ActiveNetParams = chainreg.BitcoinTestNetParams
 	}
+	if cfg.Bitcoin.TestNet4 {
+		numNets++
+		cfg.ActiveNetParams = chainreg.BitcoinTestNet4Params
+	}
 	if cfg.Bitcoin.RegTest {
 		numNets++
 		cfg.ActiveNetParams = chainreg.BitcoinRegTestNetParams
@@ -1265,8 +1269,8 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 		cfg.ActiveNetParams.Params = &chainParams
 	}
 	if numNets > 1 {
-		str := "The mainnet, testnet, regtest, simnet and signet " +
-			"params can't be used together -- choose one " +
+		str := "The mainnet, testnet, testnet4, regtest, simnet and " +
+			"signet params can't be used together -- choose one " +
 			"of the five"
 
 		return nil, mkErr(str)
@@ -1275,9 +1279,10 @@ func ValidateConfig(cfg Config, interceptor signal.Interceptor, fileParser,
 	// The target network must be provided, otherwise, we won't
 	// know how to initialize the daemon.
 	if numNets == 0 {
-		str := "either --bitcoin.mainnet, or bitcoin.testnet, " +
-			"bitcoin.simnet, bitcoin.regtest or bitcoin.signet " +
-			"must be specified"
+		str := "either --bitcoin.mainnet, or --bitcoin.testnet, " +
+			"--bitcoin.testnet4, --bitcoin.simnet, " +
+			"--bitcoin.regtest or --bitcoin.signet must be " +
+			"specified"
 
 		return nil, mkErr(str)
 	}
@@ -2202,7 +2207,7 @@ func extractBitcoindRPCParams(networkName, bitcoindDataDir, bitcoindConfigPath,
 	switch networkName {
 	case "mainnet":
 		chainDir = ""
-	case "regtest", "testnet3", "signet":
+	case "regtest", "testnet3", "testnet4", "signet":
 		chainDir = networkName
 	default:
 		return "", "", "", "", fmt.Errorf("unexpected networkname %v", networkName)
diff --git a/lncfg/chain.go b/lncfg/chain.go
index 36586ff3a..cbcb9d0ee 100644
--- a/lncfg/chain.go
+++ b/lncfg/chain.go
@@ -17,6 +17,7 @@ type Chain struct {
 
 	MainNet         bool     `long:"mainnet" description:"Use the main network"`
 	TestNet3        bool     `long:"testnet" description:"Use the test network"`
+	TestNet4        bool     `long:"testnet4" description:"Use the testnet4 test network"`
 	SimNet          bool     `long:"simnet" description:"Use the simulation test network"`
 	RegTest         bool     `long:"regtest" description:"Use the regression test network"`
 	SigNet          bool     `long:"signet" description:"Use the signet test network"`
diff --git a/lncfg/config.go b/lncfg/config.go
index 94ca02f46..178ef203b 100644
--- a/lncfg/config.go
+++ b/lncfg/config.go
@@ -108,6 +108,14 @@ func CleanAndExpandPath(path string) string {
 // NormalizeNetwork returns the common name of a network type used to create
 // file paths. This allows differently versioned networks to use the same path.
 func NormalizeNetwork(network string) string {
+	// The 4th testnet isn't the "default" yet, so we'll want to explicitly
+	// point that to a "testnet4" directory.
+	if network == "testnet4" {
+		return network
+	}
+
+	// We want to collapse "testnet3" and "testnet" to the same "testnet"
+	// directory.
 	if strings.HasPrefix(network, "testnet") {
 		return "testnet"
 	}
diff --git a/lnd.go b/lnd.go
index 2b46e83c9..e63ddc196 100644
--- a/lnd.go
+++ b/lnd.go
@@ -194,6 +194,9 @@ func Main(cfg *Config, lisCfg ListenerCfg, implCfg *ImplementationCfg,
 	case cfg.Bitcoin.TestNet3:
 		network = "testnet"
 
+	case cfg.Bitcoin.TestNet4:
+		network = "testnet4"
+
 	case cfg.Bitcoin.MainNet:
 		network = "mainnet"
 
diff --git a/lnrpc/lightning.pb.go b/lnrpc/lightning.pb.go
index 42ce54284..c2ff05f3e 100644
--- a/lnrpc/lightning.pb.go
+++ b/lnrpc/lightning.pb.go
@@ -6265,8 +6265,8 @@ type GetInfoResponse struct {
 	SyncedToChain bool `protobuf:"varint,9,opt,name=synced_to_chain,json=syncedToChain,proto3" json:"synced_to_chain,omitempty"`
 	// Whether we consider ourselves synced with the public channel graph.
 	SyncedToGraph bool `protobuf:"varint,18,opt,name=synced_to_graph,json=syncedToGraph,proto3" json:"synced_to_graph,omitempty"`
-	// Whether the current node is connected to testnet. This field is
-	// deprecated and the network field should be used instead
+	// Whether the current node is connected to testnet or testnet4. This field is
+	// deprecated and the network field should be used instead.
 	//
 	// Deprecated: Marked as deprecated in lightning.proto.
 	Testnet bool `protobuf:"varint,10,opt,name=testnet,proto3" json:"testnet,omitempty"`
diff --git a/lnrpc/lightning.proto b/lnrpc/lightning.proto
index 2de09da1f..ca40e4b4c 100644
--- a/lnrpc/lightning.proto
+++ b/lnrpc/lightning.proto
@@ -2008,8 +2008,8 @@ message GetInfoResponse {
     bool synced_to_graph = 18;
 
     /*
-    Whether the current node is connected to testnet. This field is
-    deprecated and the network field should be used instead
+    Whether the current node is connected to testnet or testnet4. This field is
+    deprecated and the network field should be used instead.
     */
     bool testnet = 10 [deprecated = true];
 
diff --git a/lnrpc/lightning.swagger.json b/lnrpc/lightning.swagger.json
index c1a5ab4b4..69478fc94 100644
--- a/lnrpc/lightning.swagger.json
+++ b/lnrpc/lightning.swagger.json
@@ -5196,7 +5196,7 @@
         },
         "testnet": {
           "type": "boolean",
-          "title": "Whether the current node is connected to testnet. This field is\ndeprecated and the network field should be used instead"
+          "description": "Whether the current node is connected to testnet or testnet4. This field is\ndeprecated and the network field should be used instead."
         },
         "chains": {
           "type": "array",
diff --git a/lntest/node/config.go b/lntest/node/config.go
index 6cba60941..d71723aac 100644
--- a/lntest/node/config.go
+++ b/lntest/node/config.go
@@ -222,6 +222,8 @@ func (cfg *BaseNodeConfig) GenArgs() []string {
 	switch cfg.NetParams {
 	case &chaincfg.TestNet3Params:
 		args = append(args, "--bitcoin.testnet")
+	case &chaincfg.TestNet4Params:
+		args = append(args, "--bitcoin.testnet4")
 	case &chaincfg.SimNetParams:
 		args = append(args, "--bitcoin.simnet")
 	case &chaincfg.RegressionNetParams:
diff --git a/sample-lnd.conf b/sample-lnd.conf
index 4b9c68afa..53be66404 100644
--- a/sample-lnd.conf
+++ b/sample-lnd.conf
@@ -621,6 +621,9 @@
 ; Use Bitcoin's test network.
 ; bitcoin.testnet=false
 ;
+; Use Bitcoin's 4th version test network.
+; bitcoin.testnet4=false
+;
 ; Use Bitcoin's simulation test network
 ; bitcoin.simnet=false
 
diff --git a/server.go b/server.go
index ad521cd67..19d836a4e 100644
--- a/server.go
+++ b/server.go
@@ -2594,6 +2594,12 @@ func (s *server) Start() error {
 				chainreg.BitcoinTestnetGenesis,
 			)
 		}
+		if s.cfg.Bitcoin.TestNet4 {
+			setSeedList(
+				s.cfg.Bitcoin.DNSSeeds,
+				chainreg.BitcoinTestnet4Genesis,
+			)
+		}
 		if s.cfg.Bitcoin.SigNet {
 			setSeedList(
 				s.cfg.Bitcoin.DNSSeeds,