diff --git a/src/web/HTMLOperation.mjs b/src/web/HTMLOperation.mjs
index 0ba0ffc88b..aa160ebcf0 100755
--- a/src/web/HTMLOperation.mjs
+++ b/src/web/HTMLOperation.mjs
@@ -27,6 +27,7 @@ class HTMLOperation {
         this.manager     = manager;
 
         this.name        = name;
+        this.originalName = name;
         this.description = config.description;
         this.infoURL     = config.infoURL;
         this.manualBake  = config.manualBake || false;
@@ -56,7 +57,8 @@ class HTMLOperation {
 
         if (this.description) {
             const infoLink = this.infoURL ? `<hr>${titleFromWikiLink(this.infoURL)}` : "";
-            const content = Utils.escapeHtml(this.description + infoLink);
+            const categoryInfo = this.getCategoryInfo();
+            const content = Utils.escapeHtml(this.description + infoLink + categoryInfo);
 
             html += ` data-container='body' data-toggle='popover' data-placement='right'
                 data-content="${content}" data-html='true' data-trigger='hover'
@@ -75,6 +77,40 @@ class HTMLOperation {
     }
 
 
+    /**
+     * Gets the category information for this operation as an HTML string.
+     *
+     * @returns {string}
+     */
+    getCategoryInfo() {
+        if (!this.app.options.showOpCategories) {
+            return "";
+        }
+
+        // Use originalName because this.name may have been modified by highlightSearchStrings
+        const categories = [];
+        for (let i = 0; i < this.app.categories.length; i++) {
+            const cat = this.app.categories[i];
+            if (cat.name !== "Favourites" && cat.ops.includes(this.originalName)) {
+                categories.push(cat.name);
+            }
+        }
+
+        if (categories.length === 0) {
+            return "";
+        }
+
+        // Build the category links. Note that Bootstrap's popover sanitizer strips
+        // custom data-* attributes, so the category name is carried in the link text
+        // and resolved to a category ID by OperationsWaiter.categoryLinkClick.
+        const categoryLinks = categories.map(catName =>
+            `<a href='#' class='op-category-link'>${Utils.escapeHtml(catName)}</a>`
+        ).join(", ");
+
+        return `<hr>Category: ${categoryLinks}`;
+    }
+
+
     /**
      * Renders the operation in HTML as a full operation with ingredients.
      *
diff --git a/src/web/Manager.mjs b/src/web/Manager.mjs
index 7cde638db2..f2140335b3 100755
--- a/src/web/Manager.mjs
+++ b/src/web/Manager.mjs
@@ -232,6 +232,8 @@ class Manager {
         this.addDynamicListener(".option-item input[type=checkbox]#wordWrap", "change", this.options.setWordWrap, this.options);
         this.addDynamicListener(".option-item input[type=checkbox]#useMetaKey", "change", this.bindings.updateKeybList, this.bindings);
         this.addDynamicListener(".option-item input[type=checkbox]#showCatCount", "change", this.ops.setCatCount, this.ops);
+        this.addDynamicListener(".option-item input[type=checkbox]#showOpCategories", "change", this.ops.toggleOpCategories, this.ops);
+        this.addDynamicListener(".op-category-link", "click", this.ops.categoryLinkClick, this.ops);
         this.addDynamicListener(".option-item input[type=number]", "keyup", this.options.numberChange, this.options);
         this.addDynamicListener(".option-item input[type=number]", "change", this.options.numberChange, this.options);
         this.addDynamicListener(".option-item select", "change", this.options.selectChange, this.options);
diff --git a/src/web/html/index.html b/src/web/html/index.html
index 6ce8dd9a92..f3670fbbbd 100755
--- a/src/web/html/index.html
+++ b/src/web/html/index.html
@@ -529,6 +529,13 @@ <h5 class="modal-title">Options</h5>
                                 Show the number of operations in each category
                             </label>
                         </div>
+
+                        <div class="checkbox option-item">
+                            <label for="showOpCategories">
+                                <input type="checkbox" option="showOpCategories" id="showOpCategories" checked>
+                                Show operation category in popover
+                            </label>
+                        </div>
                     </div>
                     <div class="modal-footer">
                         <button type="button" class="btn btn-secondary" id="reset-options">Reset options to default</button>
diff --git a/src/web/index.js b/src/web/index.js
index 110f0d2bf0..9959969f76 100755
--- a/src/web/index.js
+++ b/src/web/index.js
@@ -53,6 +53,7 @@ function main() {
         imagePreview:        true,
         syncTabs:            true,
         showCatCount:        false,
+        showOpCategories:    true,
     };
 
     document.removeEventListener("DOMContentLoaded", main, false);
diff --git a/src/web/waiters/OperationsWaiter.mjs b/src/web/waiters/OperationsWaiter.mjs
index 6c2de064d4..3a92fc16fe 100755
--- a/src/web/waiters/OperationsWaiter.mjs
+++ b/src/web/waiters/OperationsWaiter.mjs
@@ -326,6 +326,85 @@ class OperationsWaiter {
         }
     }
 
+
+    /**
+     * Handler for toggling the display of operation categories in popovers.
+     * Repopulates the operations list to show/hide category information.
+     */
+    toggleOpCategories() {
+        // Repopulate operations list to apply the option change
+        this.app.populateOperationsList();
+        this.manager.recipe.initialiseOperationDragNDrop();
+
+        // Refresh search results if search is active
+        const searchInput = document.getElementById("search");
+        if (searchInput && searchInput.value) {
+            this.searchOperations({target: searchInput});
+        }
+    }
+
+
+    /**
+     * Handler for clicking a category link in an operation popover.
+     * Clears the search and opens the clicked category.
+     *
+     * @param {event} e
+     */
+    categoryLinkClick(e) {
+        e.preventDefault();
+        e.stopPropagation();
+
+        // Bootstrap's popover sanitizer strips custom data-* attributes, so the
+        // category ID is derived from the link text using the same scheme as
+        // HTMLCategory.toHtml()
+        const catName = e.target.textContent;
+        if (!catName) return;
+        const categoryId = "cat" + catName.replace(/[\s/\-:_]/g, "");
+
+        // Hide all popovers
+        $("[data-toggle=popover]").popover("hide");
+
+        // Clear search
+        const searchInput = document.getElementById("search");
+        if (searchInput) {
+            searchInput.value = "";
+        }
+
+        // Clear search results
+        const searchResults = document.getElementById("search-results");
+        if (searchResults) {
+            while (searchResults.firstChild) {
+                try {
+                    $(searchResults.firstChild).popover("dispose");
+                } catch (err) {}
+                searchResults.removeChild(searchResults.firstChild);
+            }
+        }
+
+        // Open the target category. The accordion behaviour (data-parent) closes
+        // any other open category automatically. Calling "show" on an already
+        // open category would toggle-close it mid-transition, so skip it.
+        const categoryElement = document.getElementById(categoryId);
+        if (!categoryElement) return;
+
+        const showCategory = function() {
+            if (!categoryElement.classList.contains("show")) {
+                $(categoryElement).collapse("show");
+            }
+            categoryElement.scrollIntoView({behavior: "smooth", block: "nearest"});
+        };
+
+        // Bootstrap ignores "show" while another panel in the accordion is still
+        // mid-transition (e.g. a category collapsed by the search box a moment
+        // earlier), so wait for any in-progress transition to finish first.
+        const transitioning = document.querySelector("#categories .collapsing");
+        if (transitioning) {
+            $(transitioning).one("hidden.bs.collapse shown.bs.collapse", showCategory);
+        } else {
+            showCategory();
+        }
+    }
+
 }
 
 export default OperationsWaiter;
diff --git a/tests/browser/00_nightwatch.js b/tests/browser/00_nightwatch.js
index a0f093eefa..270f694c11 100644
--- a/tests/browser/00_nightwatch.js
+++ b/tests/browser/00_nightwatch.js
@@ -252,6 +252,80 @@ module.exports = {
             .waitForElementVisible("//ul[@id='search-results']//b[text()='MD5']", 1000);
     },
 
+    "Operation category in popover": browser => {
+        const op = "//ul[@id='search-results']//li[contains(@class, 'operation') and contains(., 'MD5')]";
+
+        // Search for an operation
+        browser
+            .useCss()
+            .clearValue("#search")
+            .setValue("#search", "md5")
+            .useXpath()
+            .waitForElementVisible(op, 1000);
+
+        // Hover over the operation to show popover
+        browser
+            .moveToElement(op, 10, 10)
+            .useCss()
+            .waitForElementVisible(".popover-body", 1000);
+
+        // Assert that Category line appears in popover
+        browser
+            .expect.element(".popover-body").text.to.contain("Category:");
+
+        // Click the category link
+        browser
+            .click(".popover-body .op-category-link");
+
+        // Assert that search is cleared
+        browser
+            .useCss()
+            .expect.element("#search").value.to.equal("");
+
+        // Assert that the Hashing category is now visible
+        browser
+            .expect.element("#catHashing").to.be.visible;
+
+        // Toggle the option off. The checkbox input is restyled by Bootstrap
+        // Material Design and is not directly interactable, so click its label.
+        browser
+            .click("#options");
+
+        browser
+            .waitForElementVisible("#options-modal", 1000)
+            .click("label[for='showOpCategories']")
+            .pause(500)
+            .click("#options-modal .modal-footer .btn-secondary[data-dismiss='modal']")
+            .waitForElementNotVisible("#options-modal", 1000);
+
+        // Search again and verify category line doesn't appear
+        browser
+            .clearValue("#search")
+            .setValue("#search", "md5")
+            .useXpath()
+            .waitForElementVisible(op, 1000)
+            .moveToElement(op, 10, 10)
+            .useCss()
+            .waitForElementVisible(".popover-body", 1000);
+
+        // Assert that Category line does not appear
+        browser
+            .expect.element(".popover-body").text.to.not.contain("Category:");
+
+        // Reset option back to enabled
+        browser
+            .click("#options")
+            .waitForElementVisible("#options-modal", 1000)
+            .click("label[for='showOpCategories']")
+            .pause(500)
+            .click("#options-modal .modal-footer .btn-secondary[data-dismiss='modal']")
+            .waitForElementNotVisible("#options-modal", 1000);
+
+        // Clear search
+        browser
+            .clearValue("#search");
+    },
+
     "Alert bar": browser => {
         // Bake nothing to create an empty output which can be copied
         utils.clear(browser);