Index: frontends/php/include/classes/items/CHelpItems.php
===================================================================
--- frontends/php/include/classes/items/CHelpItems.php	(revision 65659)
+++ frontends/php/include/classes/items/CHelpItems.php	(working copy)
@@ -875,6 +875,10 @@
 					'description' => _('Startup time of Zabbix server, Unix timestamp.')
 				],
 				[
+					'key' => 'zabbix[hostgroup_count,group_name]',
+					'description' => _('Number of hosts inside host group with group_name.')
+				],
+				[
 					'key' => 'zabbix[history]',
 					'description' => _('Number of values stored in table HISTORY.')
 				],
Index: src/libs/zbxdbhigh/db.c
===================================================================
--- src/libs/zbxdbhigh/db.c	(revision 65659)
+++ src/libs/zbxdbhigh/db.c	(working copy)
@@ -629,6 +629,27 @@
 	return count;
 }
 
+int	DBget_host_count_in_group(const char *group_name)
+{
+	const char	*__function_name = "DBget_host_count_in_group";
+
+	int		count = 0;
+	DB_RESULT	result;
+	DB_ROW		row;
+
+	zabbix_log(LOG_LEVEL_DEBUG, "In %s() group_name:'%s'", __function_name, group_name);
+
+	result = DBselect("SELECT COUNT(*) FROM hosts_groups WHERE groupid IN (SELECT groupid FROM groups WHERE name = '%s')", group_name);
+
+	if (NULL != (row = DBfetch(result)))
+		count = atoi(row[0]);
+	DBfree_result(result);
+
+	zabbix_log(LOG_LEVEL_DEBUG, "End of %s():%d", __function_name, count);
+
+	return count;
+}
+
 int	DBget_proxy_lastaccess(const char *hostname, int *lastaccess, char **error)
 {
 	const char	*__function_name = "DBget_proxy_lastaccess";
Index: src/zabbix_server/poller/checks_internal.c
===================================================================
--- src/zabbix_server/poller/checks_internal.c	(revision 65659)
+++ src/zabbix_server/poller/checks_internal.c	(working copy)
@@ -205,9 +205,19 @@
 			error = zbx_strdup(error, "Invalid number of parameters.");
 			goto out;
 		}
-
 		SET_UI64_RESULT(result, CONFIG_SERVER_STARTUP_TIME);
 	}
+	else if (0 == strcmp(tmp, "hostgroup_count"))			/* zabbix["hostgroup_count","Group Name"] */
+	{
+		if (2 != nparams)
+		{
+			error = zbx_strdup(error, "Invalid number of parameters.");
+			goto out;
+		}
+		tmp  = get_rparam(&request, 1);
+
+		SET_UI64_RESULT(result, DBget_host_count_in_group(tmp));
+	}
 	else if (0 == strcmp(tmp, "host"))			/* zabbix["host",*] */
 	{
 		if (3 != nparams)