diff --git a/.gitignore b/.gitignore
index 9d56c45..34d919c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,4 +10,5 @@ conf/network.dat
 conf/alias.json
 conf/irc.json
 conf/dist.sh
+conf/blacklist.json
 env/
diff --git a/commands/blacklist.py b/commands/blacklist.py
new file mode 100644
index 0000000..89d25c6
--- /dev/null
+++ b/commands/blacklist.py
@@ -0,0 +1,41 @@
+import main
+from yaml import dump
+
+class BlacklistCommand:
+    def __init__(self, *args):
+        self.blacklist(*args)
+
+    def blacklist(self, addr, authed, data, obj, spl, success, failure, info, incUsage, length):
+        if authed:
+            if length == 1:
+                info(dump(main.blacklist))
+                return
+            elif length == 4:
+                if spl[1] == "add":
+                    if spl[2] in main.blacklist.keys():
+                        main.blacklist[spl[2]].append(spl[3])
+                    else:
+                        main.blacklist[spl[2]] = [spl[3]]
+                    success("Blacklisted %s on %s" % (spl[3], spl[2]))
+                    main.saveConf("blacklist")
+                    return
+                elif spl[1] == "del":
+                    if spl[2] in main.blacklist.keys():
+                        if spl[3] in main.blacklist[spl[2]]:
+                            main.blacklist[spl[2]].remove(spl[3])
+                            if len(main.blacklist[spl[2]]) == 0:
+                                del main.blacklist[spl[2]]
+                        else:
+                            failure("Not in list: %s" % spl[3])
+                            return
+                    else:
+                        failure("No such entry: %s" % spl[2])
+                        return
+                    success("Removed blacklist %s on %s" % (spl[3], spl[2]))
+                    main.saveConf("blacklist")
+                    return
+            else:
+                incUsage("blacklist")
+                return
+        else:
+            incUsage(None)
diff --git a/conf/help.json b/conf/help.json
index 704d979..e36b6ec 100644
--- a/conf/help.json
+++ b/conf/help.json
@@ -32,5 +32,6 @@
     "confirm": "confirm <network> <num> <token>",
     "pending": "pending [<network>]",
     "authcheck": "authcheck [<network>]",
-    "recheckauth": "recheckauth [<network>]"
+    "recheckauth": "recheckauth [<network>]",
+    "blacklist": "blacklist <network> <channel>"
 }
diff --git a/core/bot.py b/core/bot.py
index 0bb64b2..75cee7c 100644
--- a/core/bot.py
+++ b/core/bot.py
@@ -181,6 +181,10 @@ class IRCBot(IRCClient):
         increment = 0.8
         for i in channels:
             if not i in self.channels:
+                if self.net in main.blacklist.keys():
+                    if i in main.blacklist[self.net]:
+                        debug("Not joining blacklisted channel %s on %s - %i" % (i, self.net, self.num))
+                        continue
                 debug(self.net, "-", self.num, ": joining", i, "in", sleeptime, "seconds")
                 reactor.callLater(sleeptime, self.join, i)
                 sleeptime += increment
diff --git a/main.py b/main.py
index e5ec77d..caebef7 100644
--- a/main.py
+++ b/main.py
@@ -24,6 +24,7 @@ filemap = {
     "aliasdata": ["aliasdata.json", "data for alias generation", "json"],
     "alias": ["alias.json", "provisioned alias data", "json"],
     "irc": ["irc.json", "IRC network definitions", "json"],
+    "blacklist": ["blacklist.json", "IRC channel blacklist", "json"],
 
     # Binary (pickle) configs
     "network": ["network.dat", "network list", "pickle"]