diff --git a/dotnet/src/webdriver/Proxy.cs b/dotnet/src/webdriver/Proxy.cs
index 675e7a44c6a67..bb11e94624d09 100644
--- a/dotnet/src/webdriver/Proxy.cs
+++ b/dotnet/src/webdriver/Proxy.cs
@@ -72,7 +72,6 @@ public class Proxy
 {
     private ProxyKind proxyKind = ProxyKind.Unspecified;
     private bool isAutoDetect;
-    private string? ftpProxyLocation;
     private string? httpProxyLocation;
     private string? proxyAutoConfigUrl;
     private string? sslProxyLocation;
@@ -116,11 +115,6 @@ public Proxy(Dictionary<string, object> settings)
             }
         }
 
-        if (settings.TryGetValue("ftpProxy", out object? ftpProxyObj) && ftpProxyObj?.ToString() is string ftpProxy)
-        {
-            this.FtpProxy = ftpProxy;
-        }
-
         if (settings.TryGetValue("httpProxy", out object? httpProxyObj) && httpProxyObj?.ToString() is string httpProxy)
         {
             this.HttpProxy = httpProxy;
@@ -236,24 +230,6 @@ public bool IsAutoDetect
         }
     }
 
-    /// <summary>
-    /// Gets or sets the value of the proxy for the FTP protocol.
-    /// </summary>
-    [JsonPropertyName("ftpProxy")]
-    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
-    [Obsolete("FTP proxy support is deprecated and will be removed in the 4.37 version.")]
-    public string? FtpProxy
-    {
-        get => this.ftpProxyLocation;
-
-        set
-        {
-            this.VerifyProxyTypeCompatilibily(ProxyKind.Manual);
-            this.proxyKind = ProxyKind.Manual;
-            this.ftpProxyLocation = value;
-        }
-    }
-
     /// <summary>
     /// Gets or sets the value of the proxy for the HTTP protocol.
     /// </summary>
@@ -494,11 +470,6 @@ public void AddBypassAddresses(IEnumerable<string> addressesToAdd)
                 serializedDictionary["sslProxy"] = this.sslProxyLocation;
             }
 
-            if (!string.IsNullOrEmpty(this.ftpProxyLocation))
-            {
-                serializedDictionary["ftpProxy"] = this.ftpProxyLocation;
-            }
-
             if (!string.IsNullOrEmpty(this.socksProxyLocation))
             {
                 if (!this.socksVersion.HasValue)
diff --git a/dotnet/test/common/ProxyTest.cs b/dotnet/test/common/ProxyTest.cs
index 0af687bf99ada..2f0e5ab816e40 100644
--- a/dotnet/test/common/ProxyTest.cs
+++ b/dotnet/test/common/ProxyTest.cs
@@ -31,7 +31,6 @@ public void NotInitializedProxy()
         Proxy proxy = new Proxy();
 
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.Unspecified));
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -54,7 +53,6 @@ public void CanNotChangeAlreadyInitializedProxyType()
         Assert.That(() => proxy.SocksUserName = "", Throws.InvalidOperationException);
         Assert.That(() => proxy.SocksProxy = "", Throws.InvalidOperationException);
         Assert.That(() => proxy.SocksVersion = 5, Throws.InvalidOperationException);
-        Assert.That(() => proxy.FtpProxy = "", Throws.InvalidOperationException);
         Assert.That(() => proxy.HttpProxy = "", Throws.InvalidOperationException);
         Assert.That(() => proxy.SslProxy = "", Throws.InvalidOperationException);
         Assert.That(() => proxy.ProxyAutoConfigUrl = "", Throws.InvalidOperationException);
@@ -73,7 +71,6 @@ public void ManualProxy()
         Proxy proxy = new Proxy();
 
         proxy.HttpProxy = "http.proxy:1234";
-        proxy.FtpProxy = "ftp.proxy";
         proxy.SslProxy = "ssl.proxy";
         proxy.AddBypassAddresses("localhost", "127.0.0.*");
         proxy.SocksProxy = "socks.proxy:65555";
@@ -82,7 +79,6 @@ public void ManualProxy()
         proxy.SocksPassword = "test2";
 
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.Manual));
-        Assert.That(proxy.FtpProxy, Is.EqualTo("ftp.proxy"));
         Assert.That(proxy.HttpProxy, Is.EqualTo("http.proxy:1234"));
         Assert.That(proxy.SslProxy, Is.EqualTo("ssl.proxy"));
         Assert.That(proxy.SocksProxy, Is.EqualTo("socks.proxy:65555"));
@@ -104,7 +100,6 @@ public void PACProxy()
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.ProxyAutoConfigure));
         Assert.That(proxy.ProxyAutoConfigUrl, Is.EqualTo("http://aaa/bbb.pac"));
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -124,7 +119,6 @@ public void AutoDetectProxy()
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.AutoDetect));
         Assert.That(proxy.IsAutoDetect, Is.True);
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -153,7 +147,6 @@ public void ManualProxyFromDictionary()
         Proxy proxy = new Proxy(proxyData);
 
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.Manual));
-        Assert.That(proxy.FtpProxy, Is.EqualTo("ftp.proxy"));
         Assert.That(proxy.HttpProxy, Is.EqualTo("http.proxy:1234"));
         Assert.That(proxy.SslProxy, Is.EqualTo("ssl.proxy"));
         Assert.That(proxy.SocksProxy, Is.EqualTo("socks.proxy:65555"));
@@ -199,7 +192,6 @@ public void PacProxyFromDictionary()
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.ProxyAutoConfigure));
         Assert.That(proxy.ProxyAutoConfigUrl, Is.EqualTo("http://aaa/bbb.pac"));
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -222,7 +214,6 @@ public void AutoDetectProxyFromDictionary()
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.AutoDetect));
         Assert.That(proxy.IsAutoDetect, Is.True);
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -243,7 +234,6 @@ public void SystemProxyFromDictionary()
 
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.System));
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -265,7 +255,6 @@ public void DirectProxyFromDictionary()
 
         Assert.That(proxy.Kind, Is.EqualTo(ProxyKind.Direct));
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.HttpProxy, Is.Null);
         Assert.That(proxy.SslProxy, Is.Null);
         Assert.That(proxy.SocksProxy, Is.Null);
@@ -281,13 +270,11 @@ public void DirectProxyFromDictionary()
     public void ConstructingWithNullKeysWorksAsExpected()
     {
         Dictionary<string, object> rawProxy = new Dictionary<string, object>();
-        rawProxy.Add("ftpProxy", null);
         rawProxy.Add("httpProxy", "http://www.example.com");
         rawProxy.Add("autodetect", null);
 
         Proxy proxy = new Proxy(rawProxy);
 
-        Assert.That(proxy.FtpProxy, Is.Null);
         Assert.That(proxy.IsAutoDetect, Is.False);
         Assert.That(proxy.HttpProxy, Is.EqualTo("http://www.example.com"));
     }