| Ayala / Aiara | |
| Native Name: | Basque: Aiara |
| Settlement Type: | Municipality |
| Pushpin Map: | Spain Álava#Spain Basque Country#Spain |
| Pushpin Label: | Ayala |
| Pushpin Label Position: | top |
| Subdivision Type: | Country |
| Subdivision Name: | Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Name2: | Álava |
| Subdivision Type3: | Eskualdea / Comarca |
| Subdivision Name3: | Ayala/Aiara |
| Leader Title: | Mayor |
| Leader Name: | Gentza Alamillo Udaeta |
| Leader Party: | EAJ-PNV |
| Area Total Km2: | 140.90 |
| Population As Of: | 2018 |
| Population Total: | 2967 |
| Population Density Km2: | auto |
| Coordinates: | 43.0833°N -3.0631°W |
| Elevation M: | 325 |
| Postal Code Type: | Postal code |
| Postal Code: | 01476 |
Aiara in Basque or Ayala in Spanish is a municipality located in the province of Álava, in the Basque Country, northern Spain.
| Name | Population | ||||||
| Spanish | Basque | 2000 | 2005 | 2010 | 2015 | 2019 | |
| Aguíñiga | Agiñaga | 22 | 27 | 27 | 21 | 21 | |
| Añes | Añes | 29 | 29 | 24 | 20 | 22 | |
| Beotegui | Beotegi | 196 | 207 | 219 | 209 | 218 | |
| Costera | Opellora | 25 | 29 | 27 | 24 | 27 | |
| Echegoyen | Etxegoien | 21 | 17 | 19 | 22 | 13 | |
| Erbi | Erbi | 5 | 5 | 9 | 10 | 13 | |
| Izoria | Izoria | 126 | 151 | 160 | 159 | 159 | |
| Lejarzo | Lexartzu | 15 | 11 | 15 | 13 | 15 | |
| Llanteno | Lanteno | 137 | 132 | 122 | 111 | 103 | |
| Lujo | Luxo | 3 | 6 | 5 | 4 | 3 | |
| Luyando | Luiaondo | 529 | 925 | 1131 | 1242 | 1271 | |
| Madaria | Madaria | 11 | 11 | 10 | 5 | 12 | |
| Maroño | Maroño | 40 | 36 | 33 | 39 | 31 | |
| Menagaray | Menagarai | 196 | 207 | 219 | 209 | 218 | |
| Menoyo | Menoio | 42 | 42 | 36 | 33 | 33 | |
| Murga | Murga | 107 | 106 | 113 | 120 | 126 | |
| Oceca | Ozeka | 8 | 4 | 12 | 12 | 18 | |
| Olabezar | Olabezar | 75 | 62 | 63 | 69 | 73 | |
| Quejana | Keixaa | 59 | 55 | 44 | 42 | 34 | |
| Respaldiza | Arespalditza | 327 | 403 | 488 | 497 | 512 | |
| Retes de Llanteno | Erretes Lanteno | 63 | 67 | 70 | 65 | 60 | |
| Salmantón | Salmantón | 27 | 33 | 32 | 31 | 36 | |
| Sojo | Soxo | 52 | 47 | 51 | 53 | 47 | |
| Zuaza | Zuhatza | 145 | 137 | 117 | 126 | 127 | |