Each time we go to a Disney park, I find myself scouring the internet for the height requirements, trying to determine who can go on what rides.  While they do post them on the main park websites, they are not easy to locate.  Here they are for the DisneyLand parks.

Disneyland

 35" (89 cm) or taller

Gadget's Go Coaster, presented by Sparkle

Matterhorn Bobsleds

40" (102 cm) or taller

Big Thunder Mountain Railroad

Space Mountain

Splash Mountain

Star Tours

46" (117 cm) or taller

Indiana Jones™ Adventure

52" (132 cm) or taller

Autopia, presented by Chevron

Disney's California Adventure Park

36" (91 cm) or taller

Tuck and Roll's Drive'Em Buggies

40" (102 cm) or taller

Jumpin' Jellyfish

Soarin' Over California

The Twilight Zone Tower of Terror

42" (106 cm) or taller

Grizzly River Run

Mulholland Madness, presented by Alamo

Redwood Creek Challenge Trail Featuring "The Magic of Brother Bear" show

48" (122 cm) or taller

California Screamin'

Orange Stinger

52" (132 cm) or taller

Maliboomer

54" (138 cm) or taller

Tuck and Roll's Drive'Em Buggies