diff --git a/Gemfile b/Gemfile
index bd101aa..ea7cce4 100644
--- a/Gemfile
+++ b/Gemfile
@@ -17,6 +17,8 @@ gem "rom", "~> 5.3"
 gem "rom-sql", "~> 3.6"
 gem "sqlite3"
 
+gem "bcrypt", "~> 3.1"
+
 gem "good_job", "~> 4.13"
 
 group :development do
diff --git a/app/action.rb b/app/action.rb
index 85a36f0..9872821 100644
--- a/app/action.rb
+++ b/app/action.rb
@@ -5,5 +5,43 @@ require "hanami/action"
 
 module EuchreCamp
   class Action < Hanami::Action
+    include Deps[users_repo: 'repositories.users', players_repo: 'repositories.players']
+
+    protected
+
+    # Get current user from session
+    def current_user(request)
+      user_id = request.session[:user_id]
+      return nil unless user_id
+
+      users_repo.by_id(user_id)
+    end
+
+    # Get current player from session
+    def current_player(request)
+      player_id = request.session[:player_id]
+      return nil unless player_id
+
+      players_repo.by_id(player_id)
+    end
+
+    # Check if user is logged in
+    def logged_in?(request)
+      !request.session[:user_id].nil?
+    end
+
+    # Require authentication - redirect to login if not logged in
+    def require_authentication(request, response)
+      unless logged_in?(request)
+        response.flash[:error] = 'Please login to continue'
+        response.redirect_to '/login'
+      end
+    end
+
+    # Helper to pass current_player to view
+    def render_with_player(request, response, **options)
+      player = current_player(request)
+      response.render(view, current_player: player, **options)
+    end
   end
 end
diff --git a/app/actions/auth/login.rb b/app/actions/auth/login.rb
new file mode 100644
index 0000000..a06d76b
--- /dev/null
+++ b/app/actions/auth/login.rb
@@ -0,0 +1,63 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Actions
+    module Auth
+      class Login < EuchreCamp::Action
+        include Deps[
+          users_repo: 'repositories.users',
+          players_repo: 'repositories.players'
+        ]
+
+        # Show login form (GET)
+        class Show < Login
+          def handle(request, response)
+            render_with_player(request, response)
+          end
+        end
+
+        # Process login (POST)
+        class Create < Login
+          def handle(request, response)
+            email = request.params[:email]
+            password = request.params[:password]
+
+            user = users_repo.by_email(email)
+
+            if user && valid_password?(user, password)
+              if user.locked?
+                response.flash[:error] = 'Account is locked. Please contact support.'
+                response.redirect_to '/login'
+                return
+              end
+
+              # Record successful login
+              ip_address = request.env['REMOTE_ADDR']
+              users_repo.record_login(user[:id], ip_address)
+
+              # Create session
+              session = request.session
+              session[:user_id] = user[:id]
+              session[:player_id] = user[:player_id]
+
+              response.flash[:success] = 'Welcome back!'
+              response.redirect_to '/rankings'
+            else
+              # Record failed login
+              users_repo.record_failed_login(user[:id]) if user
+
+              response.flash[:error] = 'Invalid email or password'
+              response.redirect_to '/login'
+            end
+          end
+
+          private
+
+          def valid_password?(user, password)
+            BCrypt::Password.new(user[:password_digest]) == password
+          end
+        end
+      end
+    end
+  end
+end
diff --git a/app/actions/auth/logout.rb b/app/actions/auth/logout.rb
new file mode 100644
index 0000000..3a3ac42
--- /dev/null
+++ b/app/actions/auth/logout.rb
@@ -0,0 +1,14 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Actions
+    module Auth
+      class Logout < EuchreCamp::Action
+        def handle(request, response)
+          request.session.clear
+          response.redirect_to '/rankings'
+        end
+      end
+    end
+  end
+end
diff --git a/app/repositories/users.rb b/app/repositories/users.rb
new file mode 100644
index 0000000..fd6b441
--- /dev/null
+++ b/app/repositories/users.rb
@@ -0,0 +1,117 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Repositories
+    class Users < ::EuchreCamp::Repository[:users]
+
+      # Find user by ID
+      def by_id(id)
+        users.by_pk(id).one
+      end
+
+      # Find user by email
+      def by_email(email)
+        users.where(email: email).one
+      end
+
+      # Find user by player ID
+      def by_player_id(player_id)
+        users.where(player_id: player_id).one
+      end
+
+      # Create new user
+      def create(email:, password_digest:, player_id:)
+        users.changeset(:create, {
+          email: email,
+          password_digest: password_digest,
+          player_id: player_id,
+          confirmed: false,
+          confirmation_token: generate_token,
+          confirmation_sent_at: Time.now
+        }).commit
+      end
+
+      # Confirm user account
+      def confirm(token)
+        user = users.where(confirmation_token: token).one
+        return nil unless user
+
+        users.where(id: user[:id]).update(
+          confirmed: true,
+          confirmation_token: nil,
+          confirmation_sent_at: nil
+        )
+        user
+      end
+
+      # Request password reset
+      def request_password_reset(email)
+        user = by_email(email)
+        return nil unless user
+
+        token = generate_token
+        users.where(id: user[:id]).update(
+          reset_password_token: token,
+          reset_password_sent_at: Time.now
+        )
+        token
+      end
+
+      # Reset password
+      def reset_password(token, new_password_digest)
+        user = users.where(reset_password_token: token).one
+        return nil unless user
+
+        # Check if token is expired (1 hour)
+        if user[:reset_password_sent_at] && user[:reset_password_sent_at] < (Time.now - 3600)
+          return nil
+        end
+
+        users.where(id: user[:id]).update(
+          password_digest: new_password_digest,
+          reset_password_token: nil,
+          reset_password_sent_at: nil
+        )
+        user
+      end
+
+      # Record successful login
+      def record_login(user_id, ip_address)
+        users.where(id: user_id).update(
+          last_login_at: Time.now,
+          last_login_ip: ip_address,
+          failed_login_attempts: 0,
+          locked_until: nil
+        )
+      end
+
+      # Record failed login
+      def record_failed_login(user_id)
+        user = users.where(id: user_id).one
+        return unless user
+
+        attempts = user[:failed_login_attempts] + 1
+        locked_until = attempts >= 5 ? (Time.now + 900) : nil  # Lock for 15 minutes after 5 attempts
+
+        users.where(id: user_id).update(
+          failed_login_attempts: attempts,
+          locked_until: locked_until
+        )
+      end
+
+      # Check if account is locked
+      def account_locked?(user_id)
+        user = users.where(id: user_id).one
+        return false unless user
+
+        user[:locked_until] && user[:locked_until] > Time.now
+      end
+
+      private
+
+      def generate_token
+        SecureRandom.urlsafe_base64(32)
+      end
+    end
+  end
+end
diff --git a/app/templates/auth/login.html.erb b/app/templates/auth/login.html.erb
new file mode 100644
index 0000000..c38d99c
--- /dev/null
+++ b/app/templates/auth/login.html.erb
@@ -0,0 +1,39 @@
+<div class="auth-container">
+  <div class="auth-card">
+    <h1>Login</h1>
+
+    <% if flash[:error] %>
+      <div class="alert alert-error"><%= flash[:error] %></div>
+    <% end %>
+
+    <% if flash[:success] %>
+      <div class="alert alert-success"><%= flash[:success] %></div>
+    <% end %>
+
+    <form action="/auth/login" method="POST">
+      <div class="form-group">
+        <label for="email">Email</label>
+        <input type="email" id="email" name="email" required autocomplete="email">
+      </div>
+
+      <div class="form-group">
+        <label for="password">Password</label>
+        <input type="password" id="password" name="password" required autocomplete="current-password">
+      </div>
+
+      <div class="form-group remember-me">
+        <label>
+          <input type="checkbox" name="remember" value="1">
+          Remember me
+        </label>
+      </div>
+
+      <button type="submit" class="btn btn-primary btn-block">Login</button>
+    </form>
+
+    <div class="auth-links">
+      <p>Don't have an account? <a href="/register">Register here</a></p>
+      <p><a href="/password/reset">Forgot password?</a></p>
+    </div>
+  </div>
+</div>
diff --git a/db/migrate/20240915000008_create_users.rb b/db/migrate/20240915000008_create_users.rb
new file mode 100644
index 0000000..9e911b4
--- /dev/null
+++ b/db/migrate/20240915000008_create_users.rb
@@ -0,0 +1,27 @@
+# frozen_string_literal: true
+
+ROM::SQL.migration do
+  change do
+    create_table :users do
+      primary_key :id
+      foreign_key :player_id, :players, null: false
+      column :email, String, null: false, unique: true
+      column :password_digest, String, null: false
+      column :confirmed, Boolean, default: false
+      column :confirmation_token, String
+      column :confirmation_sent_at, DateTime
+      column :reset_password_token, String
+      column :reset_password_sent_at, DateTime
+      column :failed_login_attempts, Integer, default: 0
+      column :locked_until, DateTime
+      column :last_login_at, DateTime
+      column :last_login_ip, String
+      column :created_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+      column :updated_at, DateTime, null: false, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    add_index :users, :email, unique: true
+    add_index :users, :confirmation_token
+    add_index :users, :reset_password_token
+  end
+end
diff --git a/lib/euchre_camp/entities/user.rb b/lib/euchre_camp/entities/user.rb
new file mode 100644
index 0000000..791daf0
--- /dev/null
+++ b/lib/euchre_camp/entities/user.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+module EuchreCamp
+  module Entities
+    class User < Dry::Struct
+      attribute :id, Types::Integer
+      attribute :player_id, Types::Integer
+      attribute :email, Types::String
+      attribute :password_digest, Types::String
+      attribute :confirmed, Types::Bool
+      attribute? :confirmation_token, Types::String.optional
+      attribute? :confirmation_sent_at, Types::Time.optional
+      attribute? :reset_password_token, Types::String.optional
+      attribute? :reset_password_sent_at, Types::Time.optional
+      attribute :failed_login_attempts, Types::Integer
+      attribute? :locked_until, Types::Time.optional
+      attribute? :last_login_at, Types::Time.optional
+      attribute? :last_login_ip, Types::String.optional
+      attribute :created_at, Types::Time
+      attribute :updated_at, Types::Time
+
+      # Check if account is locked
+      def locked?
+        locked_until && locked_until > Time.now
+      end
+
+      # Check if account is confirmed
+      def active?
+        confirmed && !locked?
+      end
+
+      # Check if user is admin (for navigation purposes)
+      # This would be enhanced with actual role checking later
+      def admin?
+        false  # Placeholder - implement role checking later
+      end
+    end
+  end
+end