Blue

* Armor and clothing:
** Blue batting helmet (Fallout 4), a piece of headwear in Fallout 4.
** Blue suit, an outfit in Fallout 4.
** Padded blue jacket (Fallout 4), an outfit in Fallout 4.
** Blue and tan shirt and slacks, an Atomic Shop outfit in Fallout 76.
** Blue batting helmet (Fallout 76), a piece of headwear in Fallout 76.
** Clean blue suit (Fallout 76), an Atomic Shop outfit in Fallout 76.
** Fasnacht blue man mask, a piece of headwear in Fallout 76.
** Fasnacht blue jester mask, a piece of headwear in Fallout 76.
** Fasnacht blue owl mask, a piece of headwear in Fallout 76.
** Padded blue jacket (Fallout 76), an outfit in Fallout 76.
** Blue Ridge Caravan outfit, a piece of clothing in the Fallout 76 update Wastelanders.
* Character:
** Blue (Point Lookout), a man who worked at the Point Lookout Lighthouse, mentioned in the Fallout 3 add-on Point Lookout.
* Faction:
** Blue Ridge Caravan Company, a faction and post-War trading company in Appalachia in the Fallout 76 update Wastelanders.
* Locations:
** Blue Destiny Brothel, a whorehouse in the Capital Wasteland frequented by Herbert Dashwood, mentioned in Fallout 3.
** Blue Paradise Vacation Rentals, a location along the Colorado River in the Mojave Wasteland in Fallout: New Vegas.
** Blue Ridge Parkway, a highway in the Southern United States, mentioned in the Fallout 76 update Wastelanders.
* Items:
** Blue pass key, a miscellaneous item in Fallout and Fallout 2.
** Blue memory module, a miscellaneous item in Fallout 2.
** Blue pass card, a miscellaneous item in Fallout 3 and Fallout: New Vegas.
** Blue paint (Fallout 4), a junk item in Fallout 4.
** Blue table lamp (Fallout 4), a junk item in Fallout 4.
** Blue garden gnome, a junk item in Fallout 76.
** Blue paint (Fallout 76), a junk item in Fallout 76.
** Blue table lamp (Fallout 76), a junk item in Fallout 76.
** Blue pass key, a miscellaneous item in Fallout Tactics.
* Modifications:
** Blue (Fallout 4), a weapon mod for the baseball bat in Fallout 4.
** Blue (Fallout 76), a weapon mod for the baseball bat in Fallout 76.
** Blue paint (paint scheme), a paint scheme for several pieces of armor in Fallout 76.
** Blue headlamp, a power armor mod in Fallout 76.
*** Plan: X-01 headlamp blue, the plans for the blue headlamp mod in Fallout 76.
** Blue camo paint, a paint scheme for several weapons and armor in the Fallout 76 update Nuclear Winter.
* Other:
** "Blue Moon," a song performed by Frank Sinatra and broadcast on radio stations in Fallout: New Vegas.
** "I'm So Blue," a song performed by Katie Thompson and broadcast on radio stations in Fallout: New Vegas.
** Project Blue Blood, a pre-War research and animal development project at Big MT, mentioned in the Fallout: New Vegas add-on Old World Blues
* Real-life person:
** Jocelyn Blue, an actress who voiced Doctor Dala and the Sink in the Fallout: New Vegas add-on Old World Blues.