diff --git a/webflux/src/main/java/org/springframework/security/web/server/FormLoginAuthenticationConverter.java b/webflux/src/main/java/org/springframework/security/web/server/FormLoginAuthenticationConverter.java
new file mode 100644
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+++ b/webflux/src/main/java/org/springframework/security/web/server/FormLoginAuthenticationConverter.java
@@ -0,0 +1,73 @@
+/*
+ *
+ *  * Copyright 2002-2017 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+package org.springframework.security.web.server;
+
+import java.util.function.Function;
+
+import org.springframework.util.Assert;
+import reactor.core.publisher.Mono;
+
+import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
+import org.springframework.security.core.Authentication;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.server.ServerWebExchange;
+
+/**
+ * Converts a ServerWebExchange into a UsernamePasswordAuthenticationToken from the form
+ * data HTTP parameters.
+ *
+ * @author Rob Winch
+ * @since 5.0
+ */
+public class FormLoginAuthenticationConverter implements Function<ServerWebExchange,Mono<Authentication>> {
+
+	private String usernameParameter = "username";
+
+	private String passwordParameter = "password";
+
+	@Override
+	public Mono<Authentication> apply(ServerWebExchange serverWebExchange) {
+		return serverWebExchange.getFormData()
+			.map( data -> createAuthentication(data));
+	}
+
+	private UsernamePasswordAuthenticationToken createAuthentication(
+		MultiValueMap<String, String> data) {
+		String username = data.getFirst(this.usernameParameter);
+		String password = data.getFirst(this.passwordParameter);
+		return new UsernamePasswordAuthenticationToken(username, password);
+	}
+
+	/**
+	 * The parameter name of the form data to extract the username
+	 * @param usernameParameter the username HTTP parameter
+	 */
+	public void setUsernameParameter(String usernameParameter) {
+		Assert.notNull(usernameParameter, "usernameParameter cannot be null");
+		this.usernameParameter = usernameParameter;
+	}
+
+	/**
+	 * The parameter name of the form data to extract the password
+	 * @param passwordParameter the password HTTP parameter
+	 */
+	public void setPasswordParameter(String passwordParameter) {
+		Assert.notNull(passwordParameter, "passwordParameter cannot be null");
+		this.passwordParameter = passwordParameter;
+	}
+}
diff --git a/webflux/src/test/java/org/springframework/security/web/server/FormLoginAuthenticationConverterTests.java b/webflux/src/test/java/org/springframework/security/web/server/FormLoginAuthenticationConverterTests.java
new file mode 100644
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+++ b/webflux/src/test/java/org/springframework/security/web/server/FormLoginAuthenticationConverterTests.java
@@ -0,0 +1,103 @@
+/*
+ *
+ *  * Copyright 2002-2017 the original author or authors.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  *      http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package org.springframework.security.web.server;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.springframework.security.core.Authentication;
+import org.springframework.util.LinkedMultiValueMap;
+import org.springframework.util.MultiValueMap;
+import org.springframework.web.server.ServerWebExchange;
+import reactor.core.publisher.Mono;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+/**
+ * @author Rob Winch
+ * @since 5.0
+ */
+@RunWith(MockitoJUnitRunner.class)
+public class FormLoginAuthenticationConverterTests {
+	@Mock
+	private ServerWebExchange exchange;
+
+	private MultiValueMap<String,String> data = new LinkedMultiValueMap<>();
+
+	private FormLoginAuthenticationConverter converter = new FormLoginAuthenticationConverter();
+
+	@Before
+	public void setup() {
+		when(this.exchange.getFormData()).thenReturn(Mono.just(this.data));
+	}
+
+	@Test
+	public void applyWhenUsernameAndPasswordThenCreatesTokenSuccess() {
+		String username = "username";
+		String password = "password";
+		this.data.add("username", username);
+		this.data.add("password", password);
+
+		Authentication authentication = this.converter.apply(this.exchange).block();
+
+		assertThat(authentication.getName()).isEqualTo(username);
+		assertThat(authentication.getCredentials()).isEqualTo(password);
+		assertThat(authentication.getAuthorities()).isEmpty();
+	}
+
+	@Test
+	public void applyWhenCustomParametersAndUsernameAndPasswordThenCreatesTokenSuccess() {
+		String usernameParameter = "j_username";
+		String passwordParameter = "j_password";
+		String username = "username";
+		String password = "password";
+		this.converter.setUsernameParameter(usernameParameter);
+		this.converter.setPasswordParameter(passwordParameter);
+		this.data.add(usernameParameter, username);
+		this.data.add(passwordParameter, password);
+
+		Authentication authentication = this.converter.apply(this.exchange).block();
+
+		assertThat(authentication.getName()).isEqualTo(username);
+		assertThat(authentication.getCredentials()).isEqualTo(password);
+		assertThat(authentication.getAuthorities()).isEmpty();
+	}
+
+	@Test
+	public void applyWhenNoDataThenCreatesTokenSuccess() {
+		Authentication authentication = this.converter.apply(this.exchange).block();
+
+		assertThat(authentication.getName()).isNullOrEmpty();
+		assertThat(authentication.getCredentials()).isNull();
+		assertThat(authentication.getAuthorities()).isEmpty();
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void setUsernameParameterWhenNullThenIllegalArgumentException() {
+		this.converter.setUsernameParameter(null);
+	}
+
+	@Test(expected = IllegalArgumentException.class)
+	public void setPasswordParameterWhenNullThenIllegalArgumentException() {
+		this.converter.setPasswordParameter(null);
+	}
+}