Can I make an iPhone app using windows?

My company wants to make an app for iPhone but non of us have an apple computer. Is there a way we can do it without having to use a mac.

We were able to make an app for the Google Play store so I believe we have the groundwork in place to make it for Apple.

Apple's SDK is only designed for Macs. Some people have been able to work outside of standards and develop some apps using Windows. Leaving the standards behind means that there's very little support for developing on Windows and you should prepare yourself for some frustration. This article covers some of the tools for developing iOS apps for Windows users: http://maniacdev.com/2010/01/iphone-development-windows-options-available

IMHO: Get a used Mac Mini so that the all your time can be spent on app development instead of dealing with the conflicts of trying to develop on a platform that was not designed for the task.