Adding category dropdown list to theme options page

You should use 

<?php wp_dropdown_categories(); ?>

http://codex.wordpress.org/Function_Reference/wp_dropdown_categories

Related Posts:

  1. Display list of Sub-Categories and the posts they contain, within one main Category
  2. Categories list loop – add separator every year
  3. Exclude a category from the filed under list only on some templates
  4. Listing all posts from current category on page
  5. Display only one result from “get_the_category_list”
  6. Listing Parent, Child and GrandChild Categories and then the PostTitles on Page Template !
  7. How to find the number of Tags a post has?
  8. Get woocommerce catogry
  9. wordpress wp_list_categories
  10. wp_dropdown_categories and custom taxonomy + custom post type
  11. Get all sub-categories of a parent category
  12. Check child/parent categories if exists
  13. Show Available Taxonomy List with Current Category
  14. Display the last post by each category?
  15. List categories with custom code
  16. limit a list of tags to one category [closed]
  17. Categories list loop – add separator every 3 categories [closed]
  18. how to wordpress When I click on the category link, subcategories appear
  19. new WP_Query all post in a category inside the loop
  20. get listed category’s id?
  21. List Child Categorie and hide the parent
  22. Hide specific category from wp_list_categories
  23. How do I add a separator to my list of terms with get_category
  24. How to show a list of only categories (exclude subcategories)
  25. Category list with postcount
  26. Getting the posts list visualised in categories tree
  27. Return all Tags and Categories in Separate List
  28. get taxonomy list in a page in the wordpress
  29. How Can Hide Define Category in Post Contents?
  30. AZ Directory category
  31. Search tag within category
  32. Listing category
  33. List products from current category
  34. Way to show content of a post, but if exceeds character limit revert to excerpt?
  35. list taxonomy based on taxonomy
  36. Moving Blog and Changing URL
  37. How to create an automatic MultiColoumn MegaMenu with Categories WordPress
  38. Is There a Difference Between Taxonomies and Categories?
  39. List all subcategories from category
  40. How To Find Out WordPress Category Table in MYSQL?
  41. Add custom field to Category
  42. Get Category ID inside Category template
  43. Only one category per post
  44. WordPress Multisite – global categories
  45. Get the children of the parent category
  46. Get posts from sites in Multisite?
  47. WP REST API: filter by category 1 AND category 2
  48. How To Get Parent Category Slug of Current Post
  49. Display All Products by Category with WooCommerce
  50. What is the difference between a “tag” and a “category”?
  51. Is there an easy way to make a meta box have the tabs like the Categories meta box has?
  52. How to check if I’m on the last page of posts?
  53. Display posts from the same category using next/previous post link
  54. How would I get a taxonomy/category list inside a Gutenberg block?
  55. Can I set a default featured image for a category?
  56. Check if a post is in any child category of a parent category
  57. How to export and import taxonomies (category, tag and/or custom taxonomy) and their terms
  58. Force category choice before creating new post?
  59. Gutenberg editor add a custom category as wrapper for custom blocks
  60. WooCommerce: List All Categories
  61. How to get category and archive title?
  62. Get category ID from category slug (not working)
  63. How do I remove “Uncategorized” from posts with more than 1 category?
  64. Get rid of WordPress category, tag and author archives?
  65. Individual rss feed entry length for categories?
  66. How can I create a category landing page followed by pages of posts?
  67. Remove parent category from permalink? Basically only have the child category?
  68. Custom permalink structure leads to be 404 on pagination
  69. Retrieve Product category ‘NAME’ by product category ID – WooCommerce?
  70. Posts URL structure like site.com/category/the-post-title
  71. Can’t custom taxonomies have same terms (slugs) as categories?
  72. How to get permalinks with category base working with sub-categories
  73. How to remove the term “category” from category pagination?
  74. Using wp_category_checklist in a widget
  75. WP 3.9 TinyMCE no longer loads on category description editor
  76. On the category page, get the category object
  77. Get only the top level categories using get_categories() without foreach loop
  78. Get all categories and posts in those categories
  79. How to add featured image for category (without a plugin)?
  80. How to create a custom sort for WordPress categories
  81. How to display non-hierarchical taxonomy as terms with checkboxes?
  82. Category archive by year with permalink support /category/YYYY
  83. Best Way to Redirect Category to Page and Hide Category
  84. get_terms vs. get_categories: does it matter?
  85. What is a good robots.txt?
  86. Allow users to create their own feed from selected categories?
  87. Hook when category is added to post
  88. get_categories for custom post type with a specific custom taxonomy attached
  89. Add a URL prefix to permalinks of one category of posts only
  90. How do you add categories to custom post types in WordPress?
  91. Create a category list page
  92. Catch 404 after changing permalink structure from /%postname%/ to /%category%/%postname%/
  93. Woocommerce get category image full size
  94. exclude category from get_posts?
  95. How To Modify The Loop in archives.php To Have 11 Posts Per Page and CSS Styling
  96. How can I hide a category from Contributors in the edit/add new post screen?
  97. Order get_terms() By Custom Field
  98. WordPress Multiple Category Search
  99. Should category.php and The Loop be used if the query needs to be customizable?
  100. How do the ‘tag’ and ‘category’ (default) taxonomies do ‘save_post’ action?