how to hide custom field from specific user?

[Yogesh]

I would like to hide certain fields on both the Create Issue Screen and the Edit Issue Screen based on the Current User's Role

[Nic Brough -Adaptavist-]

You can't without plugins. Jira doesn't do field level security. See https://jira.atlassian.com/browse/JRA-1330 for more detail, including work-arounds and suggestions.