Donegal–Leitrim was a parliamentary constituency represented in Dáil Éireann, the lower house of the Irish parliament or Oireachtas from 1969 to 1977. The constituency elected 3 deputies (Teachtaí Dála, commonly known as TDs) to the Dáil, on the system of proportional representation by means of the single transferable vote (PR-STV).

The constituency was created under the Electoral (Amendment) Act 1969, and first used at the 1969 general election to the 19th Dáil. It was used again for the 1973 general election to the 20th Dáil.

The constituency was used for one electoral revision only, being abolished under the Electoral (Amendment) Act 1974. The areas in County Donegal were mostly incorporated into the new Donegal constituency, while the more northerly Leitrim territories and the southern area of Donegal (around Bundoran and Ballyshannon), were incorporated into the substantially revised Sligo–Leitrim constituency.

It was defined in the 1969 Act as:^[1]

"In the administrative county of Donegal, the district electoral divisions of:

Ballintra, Ballyshannon Rural, Ballyshannon Urban, Bundoran Rural, Carrickboy, Cavangarden, Cliff, in the former Rural District of Ballyshannon;

Ballintra, Binbane, Bonnyglen, Clogher, Corkemore, Donegal, Dunkineely, Eanymore, Grousehall, Haugh, Inver, Laghy, Lough Eask, Pettigoe. Tantallon Tawnawully, Templecarn, Tullynaught, in the former Rural District of Donegal;

Magheraclogher (with the exception of the townland of Glentornan), Meenaclalp in the former Rural District of Dunfanaghy.

Annagary, Aran, Ardara, Crovehy, Crowkeeragh, Crownarad, Dawros, Doocharry, Dunglo, Fintown, Glencolmcille, Glengesh, Glenleheen, Glenties, Graffy, Inishkeel Kilcar, Kilgoly, Killybegs, Largymore, Letter macaward, Maas, Maghery, Malin Beg, Mulmosog, Rutland, Tieveskeelta, in the former Rural District of Glenties;

Altnapaste, Castlefinn, Cloghan, Cloghard Convoy (with the exception of the townlands of Aughagault, Aughagault Big, Breen, Drumkeen, Mullaghfin, Stralongford, Treantaboy), Dooish, Gleneely, Goland, Killygordon, Knock, Stranorlar, Urney West, and the townlands of:

Aghawee, Ardnaglass, Ballybogan, Camus, Churchtown, Gortin South, Gortnavilly, Legnabraid, Tirkeeran, Untshinagh Lower, Unshinagh Upper, in the district electoral division of Clondeigh South; Ardvarnock Glebe, Deerpark, Flemingstown, Kiltole Tullydonnell Lower, Tullydonnell Upper, in the district electoral division of Figart; in the former Rural District of Stranorlar;

and the urban district of Bundoran;

and, in the administrative county of Leitrim, the district electoral divisions of:

Aghalateeve, Aghanlish, Aghavoghill, Gubacreeny, Kinlough, Melvin, Tullaghan, in the former Rural District of Kinlough;

Ballaghameehan, Belhavel, Cloonclare, Cloonlogher, Drumahaire, Glenade, Glenaniff, Glenboy, Glencar, Glenfarn, Killarga, Kiltyclogher, Lurganboy, Manorhamilton, Munakill, Sramor in the former Rural District of Manorhamilton."

Note: The columns in this table are used only for presentational purposes, and no significance should be attached to the order of columns. For details of the order in which seats were won at each election, see the detailed results of that election.

• Dáil constituencies
• Politics of the Republic of Ireland
• Historic Dáil constituencies
• Elections in the Republic of Ireland