TD1 or TD-1 may refer to:

• TD1 postal district, in the TD postcode area, covering Galashiels in the Scottish Borders
• Taepodong-1 missile
• TD1 Catalog of Stellar Ultraviolet Fluxes, a star catalogue
• TD1 Personal Credits Tax Return, used by employers in Canada
• TD-1 visa or TD-1 immigration status, for family members of Canadian citizens working in the US in the TN-1 status

• X.G. Xu
• X G Xu
• XG Xu
• Xh.
• X.H.
• X H
• X.h.
• XH-20
• XHAAA
• X Haagespostoa
• XHABC-TDT
• XHAB-TV
• XHAC-FM
• XHAC-FM (Aguascalientes)
• XHADA-FM
• Xhaferr Deva
• Xhafer Spahiu
• XHAGC
• XHAGT
• XHAI-TV
• Xhaka
• XHAK-TV
• XHALC-TV
• XHAMB-FM
• Xhamia e Detarëve