diff --git a/internal/util-control/src/main/scala/sbt/internal/util/RunningProcesses.scala b/internal/util-control/src/main/scala/sbt/internal/util/RunningProcesses.scala
new file mode 100644
index 000000000..47da42d34
--- /dev/null
+++ b/internal/util-control/src/main/scala/sbt/internal/util/RunningProcesses.scala
@@ -0,0 +1,33 @@
+/*
+ * sbt
+ * Copyright 2011 - 2018, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under Apache License 2.0 (see LICENSE)
+ */
+
+package sbt.internal.util
+
+import java.util.concurrent.ConcurrentHashMap
+import scala.sys.process.Process
+
+/**
+ * Manages forked processes created by sbt. Any process registered
+ * with RunningProcesses can be killed with the killAll method. In
+ * particular, this can be used in a signal handler to kill these
+ * processes when the user inputs ctrl+c.
+ */
+private[sbt] object RunningProcesses {
+  val active = ConcurrentHashMap.newKeySet[Process]
+  def add(process: Process): Unit = active.synchronized {
+    active.add(process)
+    ()
+  }
+  def remove(process: Process): Unit = active.synchronized {
+    active.remove(process)
+    ()
+  }
+  def killAll(): Unit = active.synchronized {
+    active.forEach(_.destroy())
+    active.clear()
+  }
+}
diff --git a/main-actions/src/main/scala/sbt/ForkTests.scala b/main-actions/src/main/scala/sbt/ForkTests.scala
index 8f6b030c5..39a9c35c3 100755
--- a/main-actions/src/main/scala/sbt/ForkTests.scala
+++ b/main-actions/src/main/scala/sbt/ForkTests.scala
@@ -17,8 +17,8 @@ import sbt.io.IO
 import sbt.util.Logger
 import sbt.ConcurrentRestrictions.Tag
 import sbt.protocol.testing._
-import sbt.internal.util.ConsoleAppender
 import sbt.internal.util.Util.{ AnyOps, none }
+import sbt.internal.util.{ ConsoleAppender, RunningProcesses }
 
 private[sbt] object ForkTests {
   def apply(
@@ -147,7 +147,13 @@ private[sbt] object ForkTests {
           classOf[ForkMain].getCanonicalName,
           server.getLocalPort.toString
         )
-        val ec = Fork.java(fork, options)
+        val p = Fork.java.fork(fork, options)
+        RunningProcesses.add(p)
+        val ec = try p.exitValue()
+        finally {
+          if (p.isAlive) p.destroy()
+          RunningProcesses.remove(p)
+        }
         val result =
           if (ec != 0)
             TestOutput(
diff --git a/main/src/main/scala/sbt/EvaluateTask.scala b/main/src/main/scala/sbt/EvaluateTask.scala
index 59bf062f3..09aa2e278 100644
--- a/main/src/main/scala/sbt/EvaluateTask.scala
+++ b/main/src/main/scala/sbt/EvaluateTask.scala
@@ -480,6 +480,7 @@ object EvaluateTask {
       def cancelAndShutdown(): Unit = {
         println("")
         log.warn("Canceling execution...")
+        RunningProcesses.killAll()
         ConcurrentRestrictions.cancelAll()
         shutdown()
       }
diff --git a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/SbtHandler.scala b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/SbtHandler.scala
index 78ec27c87..b8af69c58 100644
--- a/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/SbtHandler.scala
+++ b/scripted-sbt-redux/src/main/scala/sbt/scriptedtest/SbtHandler.scala
@@ -14,12 +14,14 @@ import java.net.SocketException
 import scala.sys.process.Process
 
 import sbt.internal.scripted.{ StatementHandler, TestFailed }
+import sbt.internal.util.RunningProcesses
 
 import xsbt.IPC
 
 final case class SbtInstance(process: Process, server: IPC.Server)
 
 final class SbtHandler(remoteSbtCreator: RemoteSbtCreator) extends StatementHandler {
+  Signals.register(() => RunningProcesses.killAll())
 
   type State = Option[SbtInstance]
 
@@ -63,6 +65,9 @@ final class SbtHandler(remoteSbtCreator: RemoteSbtCreator) extends StatementHand
         ()
       } catch {
         case _: IOException => process.destroy()
+      } finally {
+        if (process.isAlive) process.destroy()
+        RunningProcesses.remove(process)
       }
   }
 
@@ -76,6 +81,7 @@ final class SbtHandler(remoteSbtCreator: RemoteSbtCreator) extends StatementHand
 
   def newRemote(server: IPC.Server): Process = {
     val p = remoteSbtCreator.newRemote(server)
+    RunningProcesses.add(p)
     try receive("Remote sbt initialization failed", server)
     catch { case _: SocketException => throw new TestFailed("Remote sbt initialization failed") }
     p