How to disable automatic indentation on new paragraphs?

I'm using a template that I can't/shouldn't modify. This template forces that every time a new paragraph begins, there is an indentation added. In some rare cases this is just looking really ugly and that's why I'd like to avoid this indentation. Is there any way to do this without changing the template?

You can avoid the paragraph indention for specific paragraphs with the \noindent macro. If you want to disable it globally you could use \setlength{\parindent}{0pt}. However, I would not recommend changing it globally in your case, because that's effectively changes the template, even if the actual file isn't modified.
• It might be useful to note that, if used inside curly brackets, \setlength{\parindent}{0pt} can disable indentation limited to the bracketed portion of the document. – mmj Sep 25 '15 at 2:43
The parskip package turns off the indentation and adds a little bit of (stretchable) space in between paragraphs. It might be an option if you don't mind the inter-paragraph spacing. Simply add \usepackage{parskip} to your preamble to use the package. Martin's last sentence applies to this solution as well, of course.