Alastair Mackellar

{{Short description|Australian cyclist (born 2002)}}

{{Use dmy dates|date=November 2024}}

{{Infobox cyclist

| name = Alastair Mackellar

| image = Alastair MacKellar - 2023 UCI Road World Championships (Men's under-23 road race).jpg

| image_size =

| caption = Mackellar in 2023

| full_name =

| nickname =

| birth_date = {{birth date and age|2002|1|20|df=y}}

| birth_place = Nambour, Australia

| height = 1.84 m

| weight = 69 kg

| currentteam = {{UCI team code|EFE}}

| discipline = Road

| role = Rider

| ridertype =

| amateuryears1 = 2018–2020

| amateurteam1 = {{UCI team code|ARA|2018}}

| amateuryears2 =

| amateurteam2 =

| proyears1 = 2021–2023

| proteam1 = {{UCI team code|ISA|2021}}{{cite web|url=https://www.uci.org/road/teams/TeamDetail/15330/2003451/276|title=Israel Cycling Academy|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=14 February 2021|archiveurl=https://archive.today/20210214145142/https://www.uci.org/road/teams/TeamDetail/15330/2003451/276|archivedate=14 February 2021}}{{cite web|url=https://www.uci.org/team-details/18434|title=Israel Premier Tech Academy|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=14 November 2024}}

| proyears2 = 2024

| proteam2 = {{UCI team code|HBJ|2024}}{{cite web | url=https://www.uci.org/team-details/19815 | title=Hagens Berman Jayco | work=UCI.org | accessdate=12 February 2024}}

| proyears3 = 2024

| proteam3 = {{UCI team code|BEX men|2024}} (stagiaire)

| proyears4 = 2025–

| proteam4 = {{UCI team code|EFE|2025}}

| majorwins =

| medaltemplates =

| show-medals =

}}

Alastair Mackellar (born 20 January 2002) is an Australian cyclist, who currently rides for UCI WorldTeam {{UCI team code|EFE}}.{{cite web|url=https://www.uci.org/team-details/20240|title=EF Education–EasyPost|publisher=UCI|access-date=January 7, 2025}}