ISC许可证是一种开放源代码许可证，在功能上与两句版的BSD许可证相同。 这份许可证是由ISC（Internet Systems Consortium）所发明，在ISC释出软件时所使用的。不过有许多开放源代码团体也使用，其中一个有名的例子是OpenBSD对于新写的程序码都会尽量使用ISC许可证。

ISC许可证的样版如下：

Copyright (c) 4-digit year, Company or Person's Name <E-mail address>

Permission to use, copy, modify, and distribute this software for any

purpose with or without fee is hereby granted, provided that the above

copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES

WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF

MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR

ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES

WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN

ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF

OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.