Optimizing workflow execution by the intelligent dispatching of workflow tasks against a grid computing system or infrastructure. For some embodiments, a grid task dispatcher may be configured to dispatch tasks in a manner that takes into account information about an entire workflow, rather than just an individual task. Utilizing information about the tasks (task metadata), such a workflow-scoped task dispatcher may more optimally assign work to compute resources available on the grid, leading to a decrease in workflow execution time and more efficient use of grid computing resources.